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>
#include <algorithm>
using namespace std;
int insec(int s1, int e1, int s2, int e2){
if(s1 > s2) swap(s1, s2), swap(e1, e2);
if(s2 < e1) return 1;
if(s2 == e1) return 0;
return -1;
}
int n, s1[11], s2[11], e1[11], e2[11];
int ans;
int main(){
scanf("%d", &n);
for(int i = 0; i < n; i++) scanf("%d%d", s1 + i, e1 + i);
for(int i = 0; i < n; i++) scanf("%d%d", s2 + i, e2 + i);
ans = n;
for(int i = 0; i < n; i++){
if(insec(s1[i], e1[i], s2[i], e2[i]) == 0) ans--;
if(insec(s1[i], e1[i], s2[i], e2[i]) < 0) {puts("0"); return 0;}
}
printf("%d", ans);
}
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