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 Python (3.8.2) (judge verdict: Accepted)

# 標準出力を取得（strデータ）
# A タップの口数　B 必要な口数
A, B = input().split()

# A, B を integerに変換
A = int(A)
B = int(B)

# OAタップの数を表す変数の初期値を 1 とする
num = 1

# B(必要な口数) が 1 の時はタップは必要ない
if B == 1:
    num = 0
else:
    while (A - 1) * (num - 1) + A < B:
        num = num + 1

# 結果を出力
print(num)