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 main()
{
	int N;
	cin >> N;
	int A[24], B[24];
	for(int i=0; i<N*2; i++) cin >> A[i];
	for(int i=0; i<N*2; i++) cin >> B[i];
	int Cnt = 0;
	for(int i=0; i<N*2; i+=2)
	{
		if((A[i]<B[i] && B[i]<A[i+1]) || (A[i]<B[i+1] && B[i+1]<A[i+1])) Cnt++;
	}
	if(Cnt == 0) cout << "-1";
	else cout << Cnt;
	cout << endl;
}
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