import math
n = int(input())
a,b,c=map(int,input().split())
# inc exc pol 
# a + b + c - ab - ac - bc + abc
A,B,C = n//a, n//b,n//c
AB,AC,BC = n//math.lcm(a,b), n//math.lcm(a,c), n//math.lcm(b,c)
ABC = n//math.lcm(a, math.lcm(b,c))

print(A+B+C-AB-AC-BC+ABC)