#include <bits/stdc++.h>
using namespace std;
int main()
{
    unsigned long long int c = pow(2,60)-1,a,b,count1,count2;
    cin >> a >> b;
    count1 = c/b;
    if (c-c/b > 0) count1++;
    count2= c/(-a);
    if (c-count2>0) count2++;
    cout << min(count1,count2+1);
}