import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        long a = sc.nextInt();
        long b = sc.nextInt();
        long c = sc.nextInt();
        long ans = n / a + n / b + n / c - n / getLCM(a, b) - n / getLCM(b, c) - n / getLCM(c, a) + n / getLCM(a, b, c);
        System.out.println(ans);
    }
    
    static long getLCM(long a, long b) {
        return a / getGCD(a, b) * b;
    }
    
    static long getLCM(long a, long b, long c) {
        return getLCM(a, getLCM(b, c));
    }
    
    static long getGCD(long a, long b) {
        if (b == 0) {
            return a;
        } else {
            return getGCD(b, a % b);
        }
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}