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: Wrong Answer)

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

namespace Atc_0031
{
    class Program
    {
        static void Main(string[] args)
        {
            var str = Console.ReadLine();

            int A = int.Parse(str.Split(' ')[0]);

            int B = int.Parse(str.Split(' ')[1]);

            int result = 0;
            int t = 1;

            while (true)
            {
                result++;
                t = (t - 1);
                t += A;

                if (B <= t)
                {
                    break;
                }               
            }

            Console.WriteLine(result);

        }
    }
}