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 Go (1.6) (judge verdict: Accepted)

package main
 
import (
    "fmt"
)
 
func main() {
	var A,B int
  	fmt.Scan(&A)
  	fmt.Scan(&B)
  	if B ==1{
      	fmt.Print(0)
    }else if B <= A {
      	fmt.Print(1)
    }else if (B-A)%(A-1)!=0{
      	fmt.Print((B-A)/(A-1) +2)
  	}else{
      	fmt.Print((B-A)/(A-1) +1)
  	}        
}