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 C (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
int main()
{
    int a, b;
	int tapcount = 1; //タップ数
	
	scanf("%d %d", &a, &b);
	
	if(b == 1){
		//タップ不要
		tapcount = 0;
	}else if(b <= a){
		//タップ1つでよし
		tapcount = 1;
	}else{
		while(1){
			if(b <= ((a - 1) * (tapcount - 1)) + a){
				break;
			}else{
				tapcount++;
			}
		}
	}
	
	printf("%d" , tapcount);
  
    return 0;
}