#include <bits/stdc++.h> using namespace std; int main() { int n,y1,y2,cnt=0,maxn=-1; cin>>n; for(int i=1;i<=n;i++){ cin>>y1>>y2; if(y1>=90&&y1<=140&&y2>=60&&y2<=90){ cnt++; } else { cnt=0; } maxn=max(maxn,cnt); } cout<<maxn; }