#include <bits/stdc++.h>
using namespace std;
int main(){
    int n, m;cin >> n >> m;
    if(n == m){
        cout << 0;
        return 0;
    }
    if(m == 1){
        int p = 0, cur = 1;
        while(cur < n){
            cur <<= 1;
            p++;
        }
        cout << p << endl;
        return 0;
    }
    else if(m == 2){
        if(n == 1 || n == 2){
            cout << 0 << endl;
            return 0;
        }
        if(n == 3){
            cout << 2 << endl;
            return 0;
        }
        if(n == 4){
            cout << 3 << endl;
            return 0;
        }
        if(n == 5){
            cout << 4 << endl;
            return 0;
        }
        if(n == 6){
            cout << 4 << endl;
            return 0;
        }
        if(n == 7){
            cout << 5 << endl;
            return 0;
        }   
        if(n == 8){
            cout << 5 << endl;
            return 0;
        }
    }
    cout << 29 << endl;
    return 0;
}