#include<stdio.h>
int main()
{
    int n;
    long long factorial = 1;
    if(scanf("%d", &n)!= 1)
    return 0;
    if(n < 0)
     {
        printf("Invalid input");
        return 0;
     }
    else 
     {
        for (int i = 1; i <= n;i++)
        factorial *=1;
     }
     printf("%lld", factorial);
}
return 0;
}