#include <cstdio>
#include <cstdint>

intmax_t const mod = 1000'000'007;

int main() {
    intmax_t n;
    scanf("%jd", &n);
    if (n >= mod) return puts("0"), 0;
    
    intmax_t res = 1;
    for (intmax_t i = 1; i <= n; ++i) (res *= i) %= mod;
    printf("%jd\n", res);
}