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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

class Program
{
    static void Main(string[] args)
    {
        var p = new Program();
        var input = p.ConvertIntArray(p.ReadInput());
        var count = 1;
        var A = input[0] - 1;
        var B = input[1] - 1;

        if(input[1] == 1)
        {
            count = 0;
        }
        else
        {
            while (B > A)
            {
                B  -= A;
                count++;
            }
        }
        Console.WriteLine(count);
    }


    public string[] ReadInput()
    {
        return Console.ReadLine().Split(' ');
    }

    public int[] ConvertIntArray(string[] x)
    {
        var convertedArray = new int[x.Length];
        for (var i = 0; i < x.Length; i++)
        {
            convertedArray[i] = int.Parse(x[i]);
        }

        return convertedArray;
    }

}