let caseCount = Int(readLine()!)!

func answer(_ givenStress: Int, _ workDays: Int) -> Int {
    // workDays + "days"（休み始めてからストレス０になるまでの日にち）
    
    let days = givenStress * workDays
    return workDays + days
}

// func answerTest(_ givenStress: Int, _ workDays: Int, expected: Int) -> Bool {
//     return answer(givenStress, workDays) == expected
// }

for _ in 0..<caseCount {
    let input = readLine()!.split(separator: " ").map { Int($0)! }
    print(answer(input[0], input[1]))
}