# https://yukicoder.me/problems/891
# n(AorBorC) = n(A) + n(B) + n(C) - n(A&B) - n(B&C) - n(C&A) + n(A&B&C)
n = gets.to_i
A, B, C = gets.split.map(&:to_i)
a = n / A
b = n / B
c = n / C
ab = n / (A.lcm(B))
ac = n / (A.lcm(C))
bc = n / (B.lcm(C))
abc = n / (A.lcm(B.lcm(C)))

puts a + b + c - ab - ac - bc + abc