include <iostream>

using namespace std; int main() { long long n,cem=0,say=0,m=0; cin>>n; for(int i=0;i<n;i++) { for(int j=0;j<n;j++) { m++; if(i%2!=0 && j%2!=0) cem=cem+m; else if(i%2==0 && j%2==0) say=say+m; } } cout<<say+cem; }