for (int ii=n; ii>0; ii--) {fato = fato*ii;}
public static void Main()
sum[0] = arr[0] + arr[2];
sum[1] = arr[0] + arr[3];
sum[2] = arr[0] + arr[4];
sum[3] = arr[1] + arr[3];
sum[4] = arr[1] + arr[4];
sum[5] = arr[2] + arr[4];
sum[6] = arr[0] + arr[2] + arr[4];
Console.WriteLine(Math.Max(sum[2],Math.Max(sum[3],Math.Max(sum[4],Math.Max(sum[5],Math.Max(sum[6],Math.Max(sum[0], sum[1])))))));
Console.WriteLine(fato(n));