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.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace abc139_b
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] kazu = Console.ReadLine().Split(' ');
            int A = int.Parse(kazu[0]);
            int B = int.Parse(kazu[1]);
            int consent = 1;
            int tap = 0;

            for(int i = 0; consent <= B; i++)
            {
                if(consent < B)
                {
                    consent = consent - 1 + A;
                    tap = tap + 1;

                    if(consent > B)
                    {
                        Console.WriteLine(tap);
                    }
                    
                }
                else if(consent == B)
                {
                    Console.WriteLine(tap);
                    break;
                }
            }
            Console.Read();
        }
    }
}