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;
using System.Linq;
namespace B___Power_Socket
{
    class Program
    {
        static void Main(string[] args)
        {
            var line = Console.ReadLine().Trim().Split(' ').Select(n => int.Parse(n)).ToArray();
            var A = line[0];
            var B = line[1];
            var count = 0;
            var ports = 0;
            ports = A;
            count = 1;
            if (A < B)
            {
                while (true)
                {
                    if ((ports + (A - 1)) >= B)
                    {
                        count++;
                        break;
                    }
                    else
                    {
                        count++;
                        ports += A - 1;
                    }
                }
            }
            Console.WriteLine(count);
        }
    }
}