func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     cin.tie(NULL);     if (fopen( input.txt ,  r )) {       freopen( input.txt ,  r , stdin);       freopen( output.txt ,  w , stdout);     }     int n, a, b;     cin >> n;     bool visit[1000005] = {false};     int ans = -1;     while (n--) {       cin >> a >> b;       while (visit[a] || a < ans) {         a += b;       }       ans = max(ans, a);       visit[a] = true;     }     cout << ans;     return 0;   }   