#include <stdio.h>

int Fact( int n );

int main(void)
{
    int n;

    n = 5;
    printf("Factorial of %d is %d.\n", n, Fact(n));
    return 0;
}

int Fact( int n )
{
    if ( n == 1 )
        return 1;
    else
        return n * Fact( n - 1 );
}