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;
for(int i = 1; i <= N; i++)
{
int a, b; cin>>a>>b;
}
if(N%4==0)cout<<N/2<<"\n";
else cout<<"-1\n";
}
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