import math
m = math.gcd
N = int(input())
a, b, c=map(int, input().split())
l1 = a*b//m(a,b)
l2 = b*c//m(b,c)
l3 = c*a//m(c,a)
l = l1*c//m(l1,c)
print(N//a+N//b+N//c-N//l1-N//l2-N//l3+N//l)