#include <stdio.h>
int main(void){
	long n;
	scanf("%ld", &n);
	long ans = 1;
	int flag;
	for(long i = 1; i <= n; i++){
		ans *= (i%1000000000000);
		if(ans > 1000000000000){
			flag = 1;
		}
		ans %= 1000000000000;
	}
	if(flag == 0){
		printf("%ld\n", ans);
	}
	else{
		printf("%012ld\n", ans);
	}
	return 0;
}