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 <cstdio>
using namespace std;
int n, s[100], e[100];
int main() {
	scanf("%d", &n);
	for(int i = 0; i < n; i++) scanf("%d%d", s+i, e+i);
	
	int res = 0;
	for(int i = 0; i < n; i++) {
		int x, y; scanf("%d%d", &x, &y);
		if(s[i] < y && x < e[i]) ++res;
		else if(s[i] != y && x != e[i]) return 0 & puts("-1");
	}
	
	printf("%d\n", res);
	// your code goes here
	return 0;
}
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