import math
def lcm(a,b):		return a*b//math.gcd(a,b)
def ncm(n,a,b):		return n//lcm(a,b)
def ncn(n,a,b,c):	return n//lcm(lcm(a,b),c)
N = int(input())
a, b, c = [int(x) for x in input().split()]
n = N//a + N//b + N//c - ncm(N,a,b) - ncm(N,b,c) - ncm(N,c,a) + ncn(N,a,b,c)
print(n)