func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, a[100005], p[100005];   long long cost;   int main() {     ios_base::sync_with_stdio(false);     cin >> n;     for (int i = 0; i < n; ++i) {       cin >> a[i] >> p[i];     }     int mn = p[0];     for (int i = 0; i < n; ++i) mn = min(p[i], mn), cost += mn * 1LL * a[i];     cout << cost << endl;     return 0;   }   