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package compJ;

import java.util.Scanner;

public class Third {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int t = sc.nextInt();

while(t>0){

Long n=sc.nextLong();

Long k= sc.nextLong();

Long ans =k*n;

if(ans%(n-1)!=0) System.out.println(ans/(n-1));

else {ans=ans/(n-1);System.out.println(ans-1);}

t--;

}

sc.close();

}

}