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