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: Wrong Answer)

using System;

class abc
{
    static void Main()
    {
        string[] O = Console.ReadLine().Split(' ');
        int A = int.Parse(O[0]);
        int B = int.Parse(O[1]);
        if (A >= B)
        {
            Console.WriteLine("1");
            return ;
        }
        int iTemp = -1;
            for (int ib = 0; ; ib++)
        {

            if (A * ib - ib >= B)
            {
                Console.WriteLine(iTemp);
                return;
            }
            iTemp += 1;
        }


    }
}