#include <bits/stdc++.h>
#include <numeric>
using namespace std;
long long lcm(long long a,long long b){
	return (a / gcd(a,b))*b;
}
int main(){
	long long n,a,b,c;
	cin >> n;
	cin >> a;
	cin >> b;
	cin >> c;
	long long a1=n/a;
	long long b1=n/b;
	long long c1=n/c;
	long long ab=n/lcm(a,b);
	long long bc=n/lcm(b,c);
	long long ac=n/lcm(a,c);
	long long abc=n/lcm(a,lcm(b,c));
	long long result=a1+b1+c1-ab-bc-ac+abc;
	cout << result << endl;
	return 0;
}