odd sum

#include<bits/stdc++.h>
using namespace    std;

int main()
{
   #ifndef ONLINE_JUDGE
       freopen("input.txt","r",stdin);
       freopen("out.txt","w",stdout);
   #endif
   int n, sum=0;
   cin>>n;
   if(n%2==0)
   {
       n = n-1;
       int mid = ceil(n/2.0);
       int OneSum = n+1;
       int totalPair = floor(OneSum/4);
       if(mid%2!=0)
       {
            sum = (OneSum*totalPair)+mid;
       }
       else  sum = (OneSum*totalPair);

   }
   else
   {
       int mid = ceil(n/2.0);
       int OneSum = n+1;
       int totalPair = floor(OneSum/4);
       if(mid%2!=0)
       {
            sum = (OneSum*totalPair)+mid;
       }
       else  sum = (OneSum*totalPair);
   }

    cout<<sum<<endl;
    return