sdb

#include <iostream>
using namespace std;

int main ()
{
int t;
cin >> t;
for (int i = 1; i <= t; ++i)
{
long long n,a,b,ans = 0;
cin >> n >> a >> b;
if (a * 2 == b)
{
ans = n * a;
}
else if (a * 2 > b)
{
if (n % 2 == 0)
{
ans = n / 2 * b;
}
else
{
ans = (n - 1) / 2 * b + a;
}
}
else
{
ans = n * a;
}
cout << ans << endl;
}
return 0;
}