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 (3.4.3) (judge verdict: Accepted)

a,b=map(int,input().split())
#p_3,p_4=map(int,input().split())
#n=int(input())
#S=input()
#T=input()
#recipe=[list(input().split())for _ in range(n)]
#m=int(input())
#have=[list(input().split())for _ in range(m)]
#s=[list(input())for _ in range(n)]
#h=list(map(int,input().split()))
#v=list(map(int,input().split()))
#c=list(map(float,input().split()))
#n=int(input())
#s=[list(map(int,input().split()))for _ in range(n)]
#s=[list(input().split())for _ in range(n)]
#s=[input()for _ in range(n)]
s=a-1
t=b-1
print((t+s-1)//s)