#include using namespace std; int main(){ int n; cin >> n; int shousuo,shuzhang,cnt = 0,max = 0; for(int i = 1;i <= n;i ++){ cin >> shousuo >> shuzhang; if(shousuo >= 90 && shousuo <= 140 && shuzhang >= 60 && shuzhang <= 90){ cnt++; } if(cnt > max){ max = cnt; }else{ cnt = 0; } } cout << max; return 0; }