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.List;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Set;
import java.util.Map;
import java.util.HashMap;
import javax.swing.text.DefaultStyledDocument.ElementSpec;

import java.util.HashSet;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int count = 0;
        int a = sc.nextInt();
        int b = sc.nextInt();
        for (int i = 1; i < 22; i++) {
            int temp = i * a - i + 1;
            if (temp >= b) {
                System.out.println(i);
                return;
            }
        }
    }
}