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 <iostream>
using namespace std;
int n;
int main()
{
if (n%2==1)
{
cout<<"-1"<<endl;
}
else
{
cout<<n/2<<endl;
}
return 0;
}
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