#include <iostream>
#include <algorithm>
using namespace std;
int T,a,b;
int sol(int x,int y) {
if(x == 1 || y== 1) {
return 0;
}
else {
return (min(a,b)-2)*2 +2;
}
}
int main() {
ios_base::sync_with_stdio(true);
cin.tie(0);
cout.tie(0);
cin >> T;
while(T--) {
cin >> a >> b;
cout << sol(a,b) << "\n";
}
}