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: Wrong Answer)

#include <bits/stdc++.h>
#pragma gcc optimize("ofast")
using namespace std;

#define ll long long //data types used often, but you don't want to type them time by time
#define ull unsigned long long
#define ui unsigned int
#define mod 1000000007
#define us unsigned short
#define IOS ios_base::sync_with_stdio(0); //to synchronize the input of cin and scanf
#define INF LONG_MAX
#define PI 3.1415926535897932384626
#define mp make_pair
#define fi first
#define se second
#define pb push_back
#define rep(x,j,n)for(ll x=j;x<n;x++)
#define repr(x,j,n)for(ll x=j;x>n;x--)
typedef vector<pair<ll,ll>> vpi;
typedef vector<ll> vi;
typedef vector<vi> vvi;

ll modexp(ll a,ll b,ll m)
{
ll r=1;
a=a%m;
while(b>0)
{
if(b&1)
r=(r*a)%m;
b=b/2;
a=(a*a)%m;
}
return r%m;
}

vi bit;//1-based indexing

void bit_update(ll x,ll n,ll val)
{
    while(x<n)
    {
        bit[x]+=val;
        x+=(x&(~x+1));
    }
}

ll bit_sum(ll x)
{
    ll sum=0;
    while(x>0)
    {
        sum+=bit[x];
        x-=(x&(~x+1));
    }
    return sum;
}



int main(){
    IOS
    int a,b;
    cin>>a>>b;
    if(b==1)cout<<"0";
    else if(b>=a)cout<<ceil(b/a);
    else cout<<"1";



    return 0;
}