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>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>
#include <string.h>

int main(void){
    int i,j,k;
    int A,B;
    int answer = 0;
    
    scanf("%d %d",&A,&B);

    answer = (B-A) / (A-1) + 1;
    if((B-A) % (A-1) != 0){
        answer++;
    }
    
    if(B < A){
        if(B == 1){
            printf("%d\n",0);
        }else{
            printf("%d\n",1);
        }
    }else{
        printf("%d\n",answer);
    }
    return 0;
}