#include <bits/stdc++.h>
using namespace std;
int main() {
int T;
cin>>T;
while (T--){
int X,Y;
cin>>X>>Y;
int a,b;
int s;
a=500-X*2;
b=1000-(Y+X)*4;
s=a+b;
int s1;
a=1000-Y*4;
b=500-(Y+X)*2;
s1=a+b;
if(s>s1)
{
cout<<s<<endl;
}
else
cout<<s1<<endl;
}
return 0;
}
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