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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); }