#include "bits/stdc++.h"
using namespace std;
#define print(x) cout<<x<<endl;
#define rep(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a) for(int i=0;i<a;i++)
#define printall(n,array) {for(int i=0;i<n;i++){cout<<array[i]<<" ";}cout<<endl;}
#define U() cout<<endl;
typedef long long ll;
typedef pair<int, int> PI;
typedef pair<int, PI> V;
typedef vector<int> VE;
const ll mod = 1000000007; //10^9+7

int v[4];
int dp[32][4]; //dp[i][j],vjを使わないでiを作るのに何枚いるか

int main(){
  REP(i,4)cin>>v[i];
  REP(i,32)REP(j,4)dp[i][j]=mod;
  REP(i,4)dp[0][i]=0;
  REP(i,32){
    REP(k,4){
      REP(j,4){
        if(j==k||dp[i][k]==mod||i+v[j]>30)continue;
        dp[i+v[j]][k]=min(dp[i+v[j]][k],dp[i][k]+1);
      }
    }
  }
  //REP(i,32){cout<<i<<" ";REP(j,4)cout<<dp[i][j]<<" ";cout<<endl;}///
  //U();///
  int ans=mod;
  REP(i,4){
    ans=min(ans,dp[v[i]][i]);
    //cout<<i<<" "<<dp[v[i]][i]<<" ";///
    //print(ans);///
  }
  print(ans+3);
}