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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
using namespace std;
#define cool ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
int main()
{ 
    cool;
    int a,b,cnt=0;
    cin>>a>>b;
    if(b==1)
    cout<<"0";
    else
    {
    b-=a;
    cnt++;
    while(1)
    {
    	if(b<=0)
    	break;
    	b-=(a-1);
    	cnt++;
	}
	cout<<cnt;
}
	return 0;
}