#include<bits/stdc++.h>
using namespace std;
int a,b,c,m;
vector <int>ans;
int solve(int n,int s,int k)
{
    //cout<<"scnrr"<<endl;
    if(n-s==0)
    {
    //    cout<<k<<endl;
        ans.push_back(k);
        return 1;
    }
    //cout<<k<<endl;
    bool help = true;
    n-=s;
    //cout<<n<<endl;
   if(n-a>=0)help=!help||solve(n,a,k+1);
   if(n-b>=0)help=!help||solve(n,b,k+1);
   if(n-c>=0)help=!help||solve(n,c,k+1);
    return help;
}






int main()
{
    int n;
    cin>>n>>a>>b>>c;
    solve(n,a,1);
    solve(n,b,1);
    solve(n,c,1);
    sort(ans.begin(),ans.end());
    reverse(ans.begin(),ans.end());
    cout<<ans[0]<<endl;
}