Mã đề 05
#include <bits/stdc++.h>
using namespace std;
long long n,i;
long double gt;
int main()
{
//freopen("giaithua.inp","r",stdin);
//freopen("giaithua.out","w",stdout);
cin>>n;
gt=1;
for (i=1;i<=n; i++)
gt=gt*(i*1.0);
cout<<fixed<<setprecision(0)<<gt;
return 0;
}