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 AtCoder_Cs
{
    public class Program
    {
        public static void Main()
        {
            decimal[] vs = Console.ReadLine().Split().Select(decimal.Parse).ToArray();
            decimal ans = 0;
            if (vs[1] > 1)
            {
                ans = 1;
            }
            if (vs[0] < vs[1])
            {
                ans = 1 + Math.Ceiling((vs[1] - vs[0]) / (vs[0] - 1));
            }
            Console.WriteLine(  ans);
        }
    }

}