#include <bits/stdc++.h>
using namespace std;
int main()
{
int q;
long long n, a, b, a2;
cin>>q;
while(q--) {
long long ans = 0;
cin>>n>>a>>b;
a2 = a*2;
if (a2 < b) {
ans += n*a;
}
else {
ans += n/2 * b + n%2*a;
}
cout<<ans<<endl;
}
return 0;
}
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