import java.util.*;
import java.util.stream.LongStream;

public class No316 {

	static boolean isMultiple(long currentInt, List<Long> numbers) {
		return numbers.stream().anyMatch(i -> currentInt % i == 0);
	}

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long maximumNumber = sc.nextLong();
		List<Long> targetNumbers = new ArrayList<>();
		targetNumbers.add(sc.nextLong());
		targetNumbers.add(sc.nextLong());
		targetNumbers.add(sc.nextLong());

		long count = LongStream.rangeClosed(1, maximumNumber)
				 .filter(i -> isMultiple(i, targetNumbers))
				 .count();
		System.out.println(count);
	}
}