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

class AtCoderBeginnerContest139
        {
            static void Main(String[] args)
            {
                string[] input = Console.ReadLine().Split(' ');

                int A = int.Parse(input[0]);
                int B = int.Parse(input[1]);

                int requiredCount = 1;
                int unusedPowerTapCount = A;

                while(B > unusedPowerTapCount)
                {
                    unusedPowerTapCount = unusedPowerTapCount + A - 1;

                    requiredCount++;
                }

                Console.WriteLine(requiredCount);
            }
}