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)

//どうかACをお恵みくださいお願いしますお願いしますお願います何もしませんから
using System;

namespace AtCoder
{
    class Program
    {
        static void Main()
        {
            string[] n = Console.ReadLine().Split();
            int A = int.Parse(n[0]);
            int B = int.Parse(n[1]);
            if((B-1)%(A-1)==0)
            {
                Console.WriteLine((B - 1) / (A - 1));
            }
            else
            {
                Console.WriteLine((B - 1) / (A - 1) + 1);
            }
        }
    }
}