/*** author: yuji9511 ***/
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using lpair = pair<ll, ll>;
const ll MOD = 1e9+7;
const ll INF = 1e18;
#define rep(i,m,n) for(ll i=(m);i<(n);i++)
#define rrep(i,m,n) for(ll i=(m);i>=(n);i--)
#define printa(x,n) for(ll i=0;i<n;i++){cout<<(x[i])<<" \n"[i==n-1];};
void print() {}
template <class H,class... T>
void print(H&& h, T&&... t){cout<<h<<" \n"[sizeof...(t)==0];print(forward<T>(t)...);}

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  ll d1,d2;
  cin >> d1 >> d2;
  if(2 * d1 < d2){
    print(0);
  }else if(2*d1 == d2){
    print(4);
  }else if(d1 < d2){
    print(8);
  }else if(d1 == d2){
    print(4);
  }else{
    print(0);
  }

}