Problem:
Score : 200 points

Problem Statement

Takahashi's house has only one socket.

Takahashi wants to extend it with some number of power strips, each with A sockets, into B or more empty sockets.

One power strip with A sockets can extend one empty socket into A empty sockets.

Find the minimum number of power strips required.

Constraints

All values in input are integers.

2 \leq A \leq 20

1 \leq B \leq 20

Input

Input is given from Standard Input in the following format:

A B

Output

Print the minimum number of power strips required.

Sample Input 1

4 10

Sample Output 1

3

3 power strips, each with 4 sockets, extend the socket into 10 empty sockets.

Sample Input 2

8 9

Sample Output 2

2

2 power strips, each with 8 sockets, extend the socket into 15 empty sockets.

Sample Input 3

8 8

Sample Output 3

1

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
 
public class Main {
	public static void main (String[] args) {
		Scanner in = new Scanner(System.in);
		
		int ss = in.nextInt();
      	int na = in.nextInt();
      	int con = 0;
      	int cnt = 1;
      
      if(na==1){System.out.print(0);
               System.exit(0);
               }
      else if(ss>=na){
        			System.out.print(1);
                     System.exit(0);
                     }
      else{
        con += ss;
      	for(int i = 0;i < na; i++){
			con = (con-1)+ss;
          	cnt++;
          	if(con>=na){break;}
        }
      }
      System.out.print(cnt);
	}
}