#from fractions import gcd
from math import gcd

# def lcm(a, b):
#     return a * b // gcd(a, b)
lcm = lambda a, b: a * b // gcd(a, b)

N = int(input())
A, B, C = map(int, input().split())
l_ab = lcm(A, B)
ans = N//A + N//B + N//C + N//lcm(l_ab,C) - N//l_ab - N//lcm(B,C) - N//lcm(C,A)

print(ans)