ZJUTOJ2020    ---2.摸鱼
#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
    int T;
    cin>>T;
    while(T--)
    {
        int n,a,b;
        cin>>n>>a>>b;
        if(b<2*a)
        {
            if(n%2==0)
            {
                cout<<b*(n/2)<<endl;
            }
            else
            {
                cout<<b*(n/2)+a<<endl;
            }
        }
        else
        {
            cout<<a*n<<endl;
        }
    }
    return 0;
}