题解

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