#include <bits/stdc++.h>
using namespace std;
int main() {
  int Q;
  cin >> Q;
  while (Q--) {
    long long n, a, b, ans;
    cin >> n >> a >> b;
    double x = b / 2.0;
    if (x > a) {
      ans = a * n;
      cout << ans << endl;
    } else {
      if (n % 2 == 0) {
        ans = n / 2 * b;
        cout << ans << endl;
      } else {
        ans = (n - 1) / 2 * b + a;
        cout << ans << endl;
      }
    }
  }
}
