from math import gcd, lcm

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

x = N//A + N//B + N//C
y = N//lcm(A, B) + N//lcm(B, C) + N//lcm(C, A)
z = N//lcm(A, B, C)

ans = x - y + z
print(ans)