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>
int main() {
	int n;
	int a[11][2], b[11][2];
	scanf("%d", &n);
	for(int i=0; i<n; i++) {
		scanf("%d %d", &a[i][0], &a[i][1]);
	}
	for(int i=0; i<n; i++) {
		scanf("%d %d", &b[i][0], &b[i][1]);
	}
	int ans = n;
	for(int i=0; i<n; i++) {
		if(a[i][1] == b[i][0] || a[i][0] == b[i][1]) ans--;
		else if(a[i][0] > b[i][1] || a[i][1] < b[i][0]) {
			printf("0\n");
			break;
		}
	}
	printf("%d\n", ans);
}
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