#include<bits/stdc++.h> using namespace std; bool wh(int a,int b) { if(a>=90&&a<=140&&b>=60&&b<=90) { return 1; } else { return 0; } } int main() { int n; cin>>n; int a[n],b[n],k=0,max=-100000; for(int i=0;i<n;i++) { cin>>a[i]>>b[i]; if(wh(a[i],b[i])) { k++; if(k>=max) { max=k; } } else { k=0; } } cout<<max; return 0; }