#include <stdio.h>

int main() {
	unsigned long long n,r=1;
	scanf("%lld",&n);
	for (unsigned long long i = n % 1000000007; i >= 1; i--)
    {
        if (i == 0)
        {
            r = 0;
            break;
        }
        r = r * i;
        if (1000000007 <= r)
        {
            r = r % 1000000007;
        }
    }
    printf("%lld", r);
	return 0;
}