#include <bits/stdc++.h>
using namespace std;
int main() {
int t;
cin>>t;
for(int i=0;i<t;i++)
{
int x,y;
cin>>x>>y;
int p,q,r,s;
p=500-(x*2);
q=1000-((y+x)*4);
r=1000-(y*4);
s=500-((y+x)*2);
int r1=p+q;
int r2=r+s;
int v=max(r1,r2);
cout<<v<<"\n";
}
return 0;
}
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