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#include
using namespace std;
int main () {
long long n;
cin >> n;
long long sum=0;
for(long long i=1; i<=n; i++){
if(i%2==0){
{sum+=i;}
if(i%2!=0){
sum-=i;
}
}
}
cout << sum << endl;
return 0;
}
Sagot :
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