#from fractions import gcd #遅い感じ
from math import gcd

def main():
    N = int(input())
    A, B, C = map(int, input().split())
    lcm = lambda a, b: a * b // gcd(a, b)
    ab = lcm(A, B)
    ans = N//A + N//B + N//C + N//lcm(ab,C) - N//ab - N//lcm(B,C) - N//lcm(C,A)
    print(ans)

main()