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

int main(){

    int tomadas_atuais,tomadas_vazias,cont=0;

    scanf("%d %d",&tomadas_atuais,&tomadas_vazias);
        if(tomadas_vazias==1){
            printf("0\n");
            return 0;
        }
            for(int i=1;i<21;i++){
              if((tomadas_atuais*i)-(i-1)>=tomadas_vazias){
                printf("%d\n",i);
                break;
              }
            }

    return 0;
}