This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int main () {
int n;
cin >> n;
if (n % 4 == 0) cout << n / 2 << '\n';
else cout << "-1\n";
}
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