#include <iostream>
using namespace std;
int main()
{
int a, b, N, x=2;
cin >> N;
for (int j = 1; j <= N; j++)
{
cin >> a;
cin >> b;
for (int i = 1; i <= x; i++)
{
if (x%a != 0 || x%b != 0)
{
x += 2;
if (x%a == 0 && x%b == 0 && x >= a && x >= b)
{
break;
}
}
}
cout << x << endl;
x = 2;
}
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSAKewoJCWludCBhLCBiLCBOLCB4PTI7CgoJY2luID4+IE47CgoJZm9yIChpbnQgaiA9IDE7IGogPD0gTjsgaisrKQoJewoJCWNpbiA+PiBhOwoJCWNpbiA+PiBiOwoKCQlmb3IgKGludCBpID0gMTsgaSA8PSB4OyBpKyspCgoJCXsKCgkJCWlmICh4JWEgIT0gMCB8fCB4JWIgIT0gMCkKCQkJewoKCQkJCXggKz0gMjsKCgkJCQlpZiAoeCVhID09IDAgJiYgeCViID09IDAgJiYgeCA+PSBhICYmIHggPj0gYikKCQkJCXsKCgkJCQkJYnJlYWs7CgkJCQl9CgoJCQl9CgkJfQoKCQljb3V0IDw8IHggPDwgZW5kbDsKCQl4ID0gMjsKCX0KCXJldHVybiAwOwp9