#include <bits/stdc++.h>   using namespace std;   int main() {     int n, s, h, m, qh, qm, qhm, d;     cin >> n >> s;     qh = 0, qm = 0;     qhm = 0;     for (int i = 0; i < n; i++) {       cin >> h >> m;       d = h * 60 + m;       if (i == 0 && d >= s + 1) {         cout << 0 <<     << 0;         return 0;       }       if (d - qhm >= 2 * s + 2) {         qhm += s + 1;         cout << qhm / 60 <<     << qhm % 60;         return 0;       }       qhm = d;     }     qhm += s + 1;     cout << qhm / 60 <<     << qhm % 60;   }   