#include<stdio.h>
int main() {
	unsigned long long n, mod = 1000000007;
	scanf("%llu", &n);
	if (n >= mod) {
		puts("0");
	}
	else {
		unsigned long long ans = 1;
		for (int i = 2; i <= n; i++) {
			ans *= i;
			ans %= mod;
		}
		printf("%llu\n", ans);
	}
}