#include<bits/stdc++.h>
#define int long long
#define mod 1000000000000
using namespace std;
int x;
signed main(){
	scanf("%lld",&x);
	if(x>=60)printf("000000000000\n");
	else{
		int ans=1;
		for(int i=1;i<=x;i++)ans=ans*i%mod;
		printf("%lld\n",ans);
	}
	return 0;
}