N = int(input())
a, b, c = map(int, input().split())

multiples_a = N // a
multiples_b = N // b
multiples_c = N // c
multiples_ab = N // (a*b)
multiples_ac = N // (a*c)
multiples_bc = N // (b*c)
multiples_abc = N // (a*b*c)

result = multiples_a + multiples_b + multiples_c - multiples_ab - multiples_ac - multiples_bc + multiples_abc

print(result)