#include <iostream>
#include <vector>
#include <math.h>
#include <stdio.h>
#include <algorithm>
#include <string>
#include <map>
#include <queue>
#define ll long long

long gcd(long a, long b) {
		if (a < b) {
			long tmp = a;
			a = b;
			b = tmp;
		}
		while(b > 0) {
			long r = a % b;
			a = b;
			b = r;

		}
		return a;

}
long lcm(long a, long b) {
		return a * b / gcd(a,b);
}
long lcm(long a, long b, long c) {
		long LCM = lcm(a,b);
		return LCM * c / gcd(LCM,c);
}

int main() {
  ll N,a,b,c;
  std::cin >> N >> a >> b >> c;
  long ac = N / a;
	long bc = N / b;
	long cc = N / c;
	long lcmAB = lcm(a,b);
	long lcmAC = lcm(a,c);
	long lcmBC = lcm(b,c);
	long lcmABC = lcm(a,b,c);
	long abc = N / (lcmAB);
	long acc = N / (lcmAC);
	long bcc = N / (lcmBC);
	long abcc = N / (lcmABC);
	std::cout << (( ac + bc + cc + abcc - abc - acc - bcc )) << std::endl;

}