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

long long gcd(long long x, long long y)
{
	while(x != 0){
		y %= x;
		if(y == 0) return x;
		x %= y;
	}
	return y;
}

long long lcm(long long x, long long y)
{
	return x * y / gcd(x, y);
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	long long n; cin >> n;
	long long a, b, c; cin >> a >> b >> c;
	cout << n / a + n / b + n / c - n /lcm(a,b) - n / lcm(a, c) - n/ lcm(b,c) + n / lcm(a, lcm(b, c)) << endl;
	return 0;	
}