Nth Multiple
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  Difficulty: Basic   Marks: 1
       

You are given a series 1, 1, 2, 3, 5, 8,.... . Your task is to tell the position of Nth multiple of a number - A. Both A and Nth multiple are part of the given series. 

Example : 
Input : 

The first line of input contains an integer T denoting the Test cases. Then T test cases follow. 
Second line contains Skill value of N
Third line contains Skill value of A

Output : 
Position of Nth multiple of A in the given series(indexing starting from 1)

Constraints :
1 ≤ T ≤ 50
1 ≤ N ≤ 10^8
1 ≤ A ≤ 10^8


Input : 
2
5
4
2
3

Output : 
30
8

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Mohit Gupta _OMG :)
Author: Mohit Gupta 4


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