#include <bits/stdc++.h>   using namespace std;   int main() {     long long n;     int a, b, q;     cin >> q;     for (int i = 0; i < q; i++) {       cin >> n >> a >> b;       if (a * 2 <= b)         cout << n * a << endl;       else {         {           if (n % 2 == 0)             cout << b * n / 2 << endl;           else             cout << b * (n / 2) + a << endl;         }       }     }     return 0;   }   