#include <bits/stdc++.h> using namespace std;

int main() { int n; cin >> n; int c = 0; int m = 0;

for (int i = 0; i < n; ++i) { int s, d; cin >> s >> d;

if (s >= 90 && s <= 140 && d >= 60 && d <= 90) {
    c++;
    if (c > m) {
        m = c;
    }
} else {
    c = 0;
}

}

cout << m<< endl; return 0; }

#include using namespace std;

int main() { int n; cin >> n; int current_streak = 0; int max_streak = 0;

for (int i = 0; i < n; ++i) {
    int systolic, diastolic;
    cin >> systolic >> diastolic;
    
    if (systolic >= 90 && systolic <= 140 && diastolic >= 60 && diastolic <= 90) {
        current_streak++;
        if (current_streak > max_streak) {
            max_streak = current_streak;
        }
    } else {
        current_streak = 0;
    }
}

cout << max_streak << endl;
return 0;

}

***不能在讨论里发题解！！！！！