#include <bits/stdc++.h>
using namespace std;
const int N = 4010;
int f[N];
int a[4];

int main() {
	int n;
	cin >> n;
	for (int i = 1; i <= 3; i++)
		cin >> a[i];
	for (int i = 1; i <= 4005; i++)
		f[i] = -0x3f3f3f3f;
	for (int i = 1; i <= 3; i++) {
		for (int j = a[i]; j <= n; j++) {
			f[j] = max(f[j], f[j - a[i]] + 1);
		}
	}
	cout << f[n] << "\n";
	return 0;
}