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.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		double sockets = in.nextDouble();
		double total_req = in.nextDouble();	
		double mid = total_req-sockets;
		if(total_req == 1.0) {
			System.out.println(0);
			System.exit(0);
		}
		//System.out.println(mid);
		double total = Math.ceil(mid/(sockets-1));
		//System.out.println(total);
		if(sockets>=total_req) {
			System.out.println(1);
			System.exit(0);
		}
//		if(total < 1.0 && total != 0) {
//			total = 1.0;
//		}
		total++;
		System.out.println((int)(total));
		

	}

}