func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int x, y;     long double maxd = 0.00000000;     long long int ans = 0;     long long int n;     cin >> n;     while (n--) {       long long int a, b;       cin >> a >> b;       ans = max(ans, (a + b));     }     cout << ans << endl;   }   