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(){
	
	int A, B;
	
	scanf("%d %d", &A, &B);
	
	
	int sum = 0;
	int count = 0;
	
	for(int i = 1; i<=B; i++){
//		count++;
		int temp = sum + A;
		if(temp >= B){
			count = i;
			break;
		}
		else{
			sum += A-1;
//			printf("Step %d : %d\n", i, sum);
		}
	}
	
	printf("%d\n", count);
	
//	int sum = 0;
//	int count = 1;

//	while(count < B){
//		count--;
//		count += A;
//		sum++;
//	}
	
//	printf("%d\n", sum);
	
	return 0;
}