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codeforces-calculating function 

#include<iostream>
#include<cmath>
using namespace std;
long long fun(long long n)
{
 if(n%2==0)
  return n/2;
 else
  return -n+fun(n-1);
}
int main()
{
 long long n,sum=0;
 cin>>n;

 cout<<fun(n);
 return 0;
}

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