#include<iostream>
using namespace std;
int main(){
int a,b;
cin>>a;
b = a/4*a/4;
cout<<b;
return 0;
}
#include <iostream> using namespace std; int main(){ int a,b; cin>>a; b = a/4*a/4; cout<<b; return 0; }//bug fixed :)
#include <iostream>
}//bug fixed :)