#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
long long int n;
cin>>n;
long long int ans=(n/2);
ans+=1;
long long int res=(n/2);
if(n%2!=0){
res+=1;
}
cout<<(ans*res)<<endl;
return 0;
}
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