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)

/*2019/08/25 */
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include<string.h>
#define MOD 1000000007
#define MIN 999999999
#define MAX -999999999
typedef long long int ll;
typedef unsigned long long int ull;
void llswap(ll *x,ll *y){ll temp;temp=*x;*x=*y;*y=temp;}
void swap(int *x,int *y){int tmp;tmp=*x;*x=*y;*y=tmp;}
int rmax(int x,int y){return x>y?x:y;}
int rmin(int x,int y){return x>y?y:x;}
ll llrmax(ll x,ll y){return x>y?x:y;}
ll llrmin(ll x,ll y){return x>y?y:x;}
int asc(const void *a,const void *b){return *(int*)a-*(int*)b;}
int desc(const void *a,const void *b){return *(int*)b-*(int*)a;}
int llasc(const void *a,const void *b){return *(ll*)a-*(ll*)b;}
int lldesc(const void *a,const void *b){return *(ll*)b-*(ll*)a;}
/*
int asc_t(const void *a,const void *b){return ((struct_t*)a)->member - ((struct_t*)b)->member;}
int desc_t(const void *a,const void *b){return ((struct_t*)b)->member - ((struct_t*)a)->member;}
*/

int main(){
    int a,b;

    scanf("%d %d",&a,&b);
    int cnt=1;
    
    int x=a;
    for(int x=a;x<b;x+=a-1,cnt++){
        //printf("x:%d\n",x);
    }

    if(b!=1)printf("%d\n",cnt);
    else printf("0\n");
    return 0;
}