Hello World

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string new_str = ""; 
for (int a = 1; a <= 14; a++)
{
    for (int b = 1; b <= 14; b++)
    {
        if(a != b)
        {
            for (int c = 1; c <= 14; c++)
            {
                if (a != c && b != c && a + b + c == 20)
                {
                    for (int d = 1; d <= 14; d++)
                    {
                        if (a != d && b != d && c != d)
                        {
                            for (int p = 1; p <= 14; p++)
                            {
                                if (a != p && b != p && c != p && d != p && c + d + p == 20)
                                {
                                    for (int f = 1; f <= 14; f++)
                                    {
                                        if (a != f && b != f && c != f && d != f && p != f)
                                        {
                                            for (int g = 1; g <= 14; g++)
                                            {
                                                if (a != g && b != g && c != g && d != g && p != g && f != g && p + f + g == 20)
                                                {
                                                    for (int h = 1; h <= 14; h++)
                                                    {
                                                        if (a != h && b != h && c != h && d != h && p != h && f != h && g != h)
                                                        {
                                                            for (int i = 1; i <= 14; i++)
                                                            {
                                                                if (a != i && b != i && c != i && d != i && p != i && f != i && g != i && h != i && g + h + i == 20)
                                                                {
                                                                    for (int j = 1; j <= 14; j++)
                                                                    {
                                                                        if (a != j && b != j && c != j && d != j && p != j && f != j && g != j && h != j && i != j)
                                                                        {
                                                                            for (int k = 1; k <= 14; k++)
                                                                            {
                                                                                if (a != k && b != k && c != k && d != k && p != k && f != k && g != k && h != k && i != k && j != k && i + j + k == 20)
                                                                                {
                                                                                    for (int l = 1; l <= 14; l++)
                                                                                    {
                                                                                        if (a != l && b != l && c != l && d != l && p != l && f != l && g != l && h != l && i != l && j != l && k != l)
                                                                                        {
                                                                                            for (int m = 1; m <= 14; m++)
                                                                                            {
                                                                                                if (a != m && b != m && c != m && d != m && p != m && f != m && g != m && h != m && i != m && j != m && k != m && l != m && k + l + m == 20)
                                                                                                {
                                                                                                    for (int n = 1; n <= 14; n++)
                                                                                                    {
                                                                                                        if (a != n && b != n && c != n && d != n && p != n && f != n && g != n && h != n && i != n && j != n && k != n && l != n && m != n && m + n + a == 20)
                                                                                                        {
                                                                                                            string num = a + " " + b + " " + c + " " + d + " " + p + " " + f + " " + g + " " + h + " " + i + " " + j + " " + k + " " + l + " " + m + " " + n;
                                                                                                            new_str = new_str + "\r\n" + num;
                                                                                                        }
                                                                                                    }
                                                                                                }
                                                                                            }
                                                                                        }
                                                                                    }
                                                                                }
                                                                            }
                                                                        }
                                                                    }
                                                                }
                                                            }
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }                      
            }                    
        }
    }
}

Console.Write(new_str);