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>

int main () {
    int A;
    int B;
    scanf("%d", &A);
    scanf("%d", &B);
    if (B == 1) {
        printf("%d\n", 0);
        return 0;
    }

    if (A >= B) {
        printf("%d\n", 1);
        return 0;
    }
    int ans = 2;
    for(;;) {
        if ((A + (ans - 1) * (A - 1)) >= B) {
            printf("%d\n", ans);
            return 0;
        }

        ans++;
    }

    return 0;
}