tijie

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