def lcm(a, b):
	return a * b // gcd(max(a, b), min(a, b))


def gcd(a, b):
	if b > 0:
		return gcd(b, a % b)
	return a


def main():
	n = int(input())
	a, b, c = map(int, input().split())
	
	lab, lbc, lca = lcm(a, b), lcm(b, c), lcm(c, a)
	labc = lcm(lab, c)
	
	num = (n//a+n//b+n//c) - (n//lab+n//lbc+n//lca) + n // labc
	
	print(num)
	
	
if __name__ == "__main__":
	main()