using System;
public class Test
{
public static void Main()
{
//for 16
Console.WriteLine("for 16");
int N=5; double A;
for(int i=0; i<=N; i++) {
A=5;
A=Math.Pow(A, i);
Console.WriteLine(A);
}
//for 17
Console.WriteLine("for 17");
double B=0;
for(int i=0; i<=N; i++) {
A=5;
A=Math.Pow(A, i);
B=B+A;
}
Console.WriteLine(B);
//for 19
Console.WriteLine("for19");
double C=1;
for (int i=2; i<=N; i++) {
C=C*i;
}
Console.WriteLine(C);
//for 20
Console.WriteLine("for 20");
C=1; double D=0;
for (int i=1; i<=N; i++) {
C=C*i; D=D+C;
}
Console.WriteLine(D);
//for 21
Console.WriteLine("for 21");
C=1; D=0;
for (int i=1; i<=N-1; i++) {
A=C*i;
D=D+1;
}
Console.WriteLine(D);
}
}
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