#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string>
#include <stack>
#include <queue>
#include <vector>
#include <list>
#include <set>
#include <map>
#include <cmath>

using namespace std;
#define PI 3.1415926535897932384626433832795
#define MOD (1000000007)
#define EPS (1e-15)
#define rep(i, n) for (int i = 0; i < (n); i++)
#define repc(i, s, n) for (int i = (s); i <= (n); i++)
#define rrep(i, n) for (int i = (n) - 1; i >= 0; i--)
#define rrepc(i, s, n) for (int i = (s); i >= (n); i--)
#define bet(x, a, b) (a) <= (x) && (x) < (b)
typedef long long ll;
typedef unsigned long long ull;

int main()
{
	int N, K;

	cin >> N >> K;
	cout << N - K + 1 << endl;

	return 0;
}

#include <iostream>
#include <cstring>
#include<vector>
#include <algorithm>
#include<cstdlib>
#include<set>
#include<math.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
#define rep(i,n) for(ll i=0;i<n;i++)

int main()
{
	int a, b;
	cin >> a >> b;
	int ans;
	ans = (b - 1) /(a - 1);
  if((b-1)%(a-1)!=0) ans++;
	cout << ans << "\n";

	return 0;
}