#include <bits/stdc++.h>
using namespace std;

long long int lcm(long long int x,long long int y){
	return x / __gcd(x,y) * y;
}

int main(){
	long long int n,a,b,c;
	cin >> n >> a >> b >> c;
	long long int total = n / a + n / b + n / c + n/lcm(a,lcm(b,c));
	long long int sa = (n/lcm(a,b) + n/lcm(b,c) + n/lcm(c,a));
	cout << total - sa << endl;
	return 0;
}