#include <bits/stdc++.h>
using namespace std;
int main(void){
    int t;
    cin>>t;
    while(t--){
        long long n,m,ans=0;
        cin>>n>>m;
        long long tmp=min(n/4,m/2);
        ans+=tmp*3;
        n-=tmp*4;
        m-=tmp*2;
        tmp=n/10;
        ans+=tmp*6;
        n-=tmp*10;
        if(n>=6)ans+=3;
        cout<<ans<<endl;
    }
    return 0;
}