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OI-codes/CodeForces/1604/D/D.cpp

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#include <bits/stdc++.h>
using namespace std;
int t, x, y;
int main() {
cin >> t;
while (t--) {
cin >> x >> y;
if (x > y) {
cout << x + y << endl;
} else if (x == y) {
cout << x << endl;
} else {
cout << y - (y % x / 2) << endl;
}
}
return 0;
}