#include <bits/stdc++.h>
using namespace std;
int main() {
int tc;
cin>>tc;
while(tc--)
{
int x,y;
cin>>x>>y;
int a,b,c,d;
a=500-(x*2);
b=1000-((y+x)*4);
c=1000-(y*4);
d=500-((y+x)*2);
int result1=a+b;
int result2=c+d;
int result=max(result1,result2);
cout<<result<<"\n";
}
return 0;
}
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