#include<stdio.h>

int main() {
    int n;
    long long factorial = 1;
    
    scanf("%d",&n);
    
    if(n<o) {
        printf("Invalid input");
    } else {
        for (int i = 1;i<=n;i++);
           factorial *=1;
    }
    printf("%lld",factorial);
  }

  return 0;
}