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 ab = getLCM(a, b); long bc = getLCM(b, c); long ca = getLCM(c, a); long abc = getLCM(ab, c); long ans = n / a + n / b + n / c - n / ab - n / bc - n / ca + n / abc; System.out.println(ans); } static long getLCM(long x, long y) { return x / getGCD(x, y) * y; } static long getGCD(long x, long y) { if (y == 0) { return x; } else { return getGCD(y, x % y); } } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); StringBuilder sb = new StringBuilder(); 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(); } }