Codeforces solution 486A Calculating Function

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

int main()
{
 long long int n,d,e;
       cin>>n;
        if(n%2==0)
        {
            cout<<n/2<<endl;
        }
        else
         {
             d=n/2;
             e=(d+1)*(-1);
             cout<<e<<endl;
          }
 return 0;
}

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