import math

N = int(input())
a, b, c = [int(i) for i in input().split()]

ans = (
    int(N / a)
    + int(N / b)
    + int(N / c)
    - int(N / math.lcm(a, b))
    - int(N / math.lcm(c, b))
    - int(N / math.lcm(a, c))
    + int(N / math.lcm(a, b, c))
)

print(ans)