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 JavaScript (Node.js 12.16.1) (judge verdict: Wrong Answer)

function main() {

    var valor = readline();
    var array = valor.split([' ']);
    for (var i = 0; i < array.length; i++) {
        array[i] = parseInt(array[i]);
    }
    var audioOutputs = array[0];
    var friends = array[1];
    var flag = false;
    var aux = 1;
    var adapters;
    for (var j = 0; flag === false; j++) {
        adapters = audioOutputs * aux - j;
        if (adapters >= friends) {
            flag = true;
        } else {
            aux = aux + 1;
        }
    }

    println(j);
}