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: Wrong Answer)

#include<stdio.h>
int main(void){
	int a,b;
	int i;
	int outlet;
	scanf("%d %d",&a,&b);
	outlet =a;
	if(a >=2 && a <= 20){
		if(b >=1 && b<=20){
			if(a >b){
				i=1;
			}
			else{
				i =1;
				while(outlet < b){
					outlet += (a-1);
					i++;
				}
				//i --;
			}
			printf("%d",i);
		}
		else return 0;
	}
	else return 0;
	return 0;
}