func_code_string: #include <bits/stdc++.h>   using namespace std;   template <class T>   T __trace(string s, T x) {     cerr << s << x << endl;     return x;   }   template <class T>   ostream& operator<<(ostream& os, const vector<T>& v) {     for (T x : v) os << x <<    ;     return os;   }   template <class T>   istream& operator>>(istream& is, vector<T>& v) {     for (T& x : v) is >> x;     return is;   }   void run() {     long long n;     cin >> n;     map<pair<long long, long long>, long long> m;     long long ans = 0;     for (long long i = 0; i < (n); i++) {       long long h, mi;       cin >> h >> mi;       m[make_pair(h, mi)]++;       ans = max(ans, m[make_pair(h, mi)]);     }     cout << ans << endl;   }   int main() {     run();     return 0;   }   