101

#include<stdio.h>

int main(void)

{

         int n;

         int factorial(int n);

 

         scanf("%d",&n);

         printf("%d\n",factorial(n));

 

         return 0;

}

 

int factorial(int n)

{

    int i,fact=1;

 

         for(i=1;i<=n;i++)

                   fact=fact*i;

 

         return fact;

}