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# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
// using System.Collections.Generic;
// using System.Linq;
// using System.Text;

class Program
{
    static void Main()
    {
        string[] arr = Console.ReadLine().Split();
        int A, B;
        A = int.Parse(arr[0]);
        B = int.Parse(arr[1]);
        int ans = 0;
        int cur = 1;
        while (cur < B)
        {
            ans++;
            cur += A - 1;
        }
        Console.WriteLine(ans);
        return;
    }
}