文件目录

#include <iostream>
using namespace std;

int main()
{
    int n, ss, sz;
    cin >> n;
    int t = 0, mt = 0;
    while (n--)
    {
        cin >> ss >> sz;
        if (ss >= 90 && ss <= 140 && sz >= 60 && sz <= 90)
        {
            t++;
            if (t > mt)
                mt = t;
        }
        else
            t = 0;
    }
    cout << mt;
    return 0;
}