func_code_string: #include <bits/stdc++.h>   using namespace std;   const int mod = 1e9 + 7;   int main() {     int n;     cin >> n;     int maxn = 0;     int x, y;     while (n--) {       scanf( %d %d , &x, &y);       maxn = max(maxn, x + y);     }     cout << maxn << endl;   }   