#include <cstdio>
#include <immintrin.h>

int main() {
	int n = 0;
	int m = 1e9 + 7;
	scanf("%d", &n);
	long long int a = 1;
	for (int i = 2; i <= n; ++i) {
		a = (a * i) % m;
	}
	printf("%d\n", a);
}