import fractions
from functools import reduce

def lcm(*n):
    return reduce(lambda a, b: a * b // fractions.gcd(a, b), n)

N = int(input())
A, B, C = map(int, input().split())

ans = N // A + N // B + N // C
ans -= N // lcm(A, B) + N // lcm(B, C) + N // lcm(C, A)
ans += N // lcm(A, B, C)

print(ans)