#include <cstdio>
#include <cstdint>

constexpr intmax_t MOD = 1e9+7;

int main() {
    int N;
    scanf("%d", &N);
    
    if (N >= MOD) return puts("0"), 0;
    
    intmax_t res = 1;
    for (int i = 2; i <= N; ++i) {
        (res *= i) %= MOD;
    }
    printf("%jd\n", res);
    // Please accept this
}