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 (1.14.1) (judge verdict: Wrong Answer)

package main

import (
	"bufio"
	"os"
	"strconv"
	"strings"
)

func main() {
	println(A())
}

func A() int {
	A, B := nextInt(), nextInt()
	out := 1
	ans := 0
	for out < B {
		out--
		out += A
		ans++
	}
	return ans
}

var sc = bufio.NewScanner(os.Stdin)

func nextLine() string {
	sc.Scan()
	return sc.Text()
}
func nextInt() int {
	a, _ := strconv.Atoi(nextLine())
	return a
}
func ReadSeparateInt() (int, int) {
	s := nextLine()
	a, b := strings.Split(s, " ")[0], strings.Split(s, " ")[1]
	c, _ := strconv.Atoi(a)
	d, _ := strconv.Atoi(b)
	return c, d
}