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>
using namespace std;

#define FOR(i,N) for(int i=0;i<N;i++)
#define ROF(i,N) for(int i=N-1;i>=0;i--)
#define ROF1(i,a,b) for(int i=(b);i>=(a);i--)
#define FOR1(i,a,b) for(int i=(a);i<=(b);i++)
#define FORi(i,a,b,c) for(int i=(a);i<=(b);i+=(c))

#define read freopen("IN.txt","r",stdin)
#define write freopen("OT.txt","w",stdout)
#define fastread {ios_base::sync_with_stdio(false);cin.tie(NULL);}
#define mem(a,b)          memset(a,b,sizeof(a))
#define EPS 1e-9
#define PI              acos(-1.0)
#define INF             2e16

#define ll              long long
#define ull             unsigned long long
#define ft              first
#define sd              second
#define bn              begin
#define en              end
#define pb              push_back
#define mp              make_pair
#define pii             pair<int,int>
#define pll             pair<LL,LL>
#define all(x) x.begin(), x.end()


#define dbg(args...) {cerr<<"-->";debugger::call(#args,args);cerr<<"\n";}
struct debugger {
    static void call(const char* it) {}
    template<typename T, typename ... aT>
    static void call(const char* it, T a, aT... rest) {
        string b;
        for (; *it&&*it != ','; ++it) if (*it != ' ')b += *it;
        cerr << b << "=" << a << " ";
        call(++it, rest...);
    }
};

int main()
{
#ifdef SunWalker
    //read;
   //write;
#endif

     int a,b,soc=0,cnt=0;
     cin>>a>>b;
     while(soc < b)
     {
          soc+=a-1;
          cnt++;
     }
     cout<<cnt<<"\n";

return 0;
}