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: Wrong Answer)

using System;

namespace _139b
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] read = Array.ConvertAll(Console.ReadLine().Split(),int.Parse);
            int A = read[0];
            int B = read[1];
            int res = 0;
            if(B == 1){
                res = 0;    
            }
            else if( B % A == 0){
                res = B/A;
            }else{
                res = (int)(B/A) + 1;
            }
            Console.WriteLine(res);
        }
    }
}