#include <iostream>
#include <strings.h>
#include <math.h>
#include <vector>
#include <map>
#include <utility>
#include <ctype.h>
using namespace std;
vector <int> dp;
int n , a , b , c ;
int cut_ribbon(int rem )
{
    if(rem == 0)
    {
        return 0;
    }
    if(rem<0)
        return -100000;
    if(dp[rem]!=-1)
    {
       return dp[rem];
    }
    int cut1 = cut_ribbon(rem-a);
    int cut2 = cut_ribbon(rem-b);
    int cut3 = cut_ribbon(rem-c);
    return dp[rem] = max(cut1, max (cut2 , cut3) )+1;
}
int main()
{
    cin>>n>>a>>b>>c;
    dp = vector<int> (4001 , -1);
    cout<<cut_ribbon(n);
    return 0;
}