#include <cstdio>
#include <cstring>
#include <random>
#include <vector>
#include <algorithm>
#include <array>
#include <functional>

using namespace std;

int main(){
	uint64_t n,m=1;
	int _=scanf("%ld",&n);
	for(uint64_t i=1;i<=n&&m;++i){
		m*=i;
		m%=1000000000000L;
		//printf("%lu %lu\n",i,m);
	}
	printf(n>16?"%012lu\n":"%lu\n",m);
	return 0;
}