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: Wrong Answer)

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 文字列の入力
		int kuchi = sc.nextInt();
		int hitsuyou = sc.nextInt();
      // 結果の初期化
      int socket = 0;
      // 比較
      socket = hitsuyou / kuchi;
      
      // 余りの計算
      int amari = hitsuyou % kuchi;
      
      
      if (amari > 0){
        // ソケットが２つ追加で必要
        socket = socket + 1;
      }else{
        // 何もしない
      }
      
        		// 出力
		System.out.println(socket);
      
    }
  
}