#include <bits/stdc++.h>
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repr(i, a, n) for (int i = n - 1; i >= a; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;
template <typename T> void chmin(T &a, T b) { a = min(a, b); }
template <typename T> void chmax(T &a, T b) { a = max(a, b); }

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  double d1, d2;
  cin >> d1 >> d2;
  if (d1 == d2)
    cout << 4 << endl;
  else if (d1 < d2) {
    double v = d2 / 2.0;
    if (d1 == v)
      cout << 4 << endl;
    else if (d1 < v)
      cout << 0 << endl;
    else
      cout << 8 << endl;

  } else
    cout << 0 << endl;
}