#include <cstdio>
#include <cmath>
int main()
{
	long long N;
	scanf("%lld",&N);
	if(N>=1000000007){
		printf("0\n");
	}else{
		long long sum=1;
		for(int i=1;i<=N;i++){
			sum = (sum*i)%1000000007;
		}
		printf("%lld\n",sum);
	}
	return 0;
}