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 Kotlin (1.0.0) (judge verdict: Wrong Answer)

import java.util.*

fun main(args: Array<String>) {
    val s = readNext().split(" ").map { Integer.parseInt(it) }

    var nowPlug = 1
    var count = 0

    while (true) {
        if ( count * s[0] - count >= s[1]) {
            break;
        }
        count++
//        if (nowPlug - 1 + s[0] >= s[1]) {
//            nowPlug = nowPlug - 1 + s[0]
//            println ( nowPlug)
//            count++
//            break
//        } else {
//            nowPlug = nowPlug - 1 + s[0]
//            println ( nowPlug)
//            count++
//        }
    }
    println(count)
}

    fun readNext(): String {
        return readLine()!!
    }