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 B
{
    public class Solver
    {
        public void Solve()
        {
            int[] input = ria();
            int A = input[0];
            int B = input[1];

            int taps = 1;
            int count = 0;

            while(taps < B)
            {
                taps = taps - 1 + A;
                count++;
            }

            Console.WriteLine(count);

        }

        int ri() { return int.Parse(Console.ReadLine()); }
        long rl() { return long.Parse(Console.ReadLine()); }
        double rd() { return double.Parse(Console.ReadLine()); }
        string rs() { return Console.ReadLine(); }

        int[] ria() { return Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray(); }
        long[] rla() { return Console.ReadLine().Split(' ').Select(x => long.Parse(x)).ToArray(); }
        double[] rda() { return Console.ReadLine().Split(' ').Select(x => double.Parse(x)).ToArray(); }
        string[] rsa() { return Console.ReadLine().Split(' '); }

    }

    public class Program
    {
        static void Main()
        {
            var solver = new Solver();
            solver.Solve();
        }
    }
}