#include <iostream>

using namespace std;

int main()
{
	int n, a, b, c;
	cin >> n >> a >> b >> c;
	
	int sum = 0;
	bool f = false;
	for(int i = 1;i <= n;i++){
		do{
			if(i % a == 0)
			f = true;
			break;
			if(i % b == 0)
			f = true;
			break;
			if(i % c == 0)
			f = true;
			break;
		}while(0);
		if(f){
			sum++;
			f = false;
		}
	}
		
	cout << sum << endl;;
}