from math import gcd

N = int(input())
a, b, c = map(int, input().split())

ab = a*b // gcd(a, b)
bc = b*c // gcd(b, c)
ca = c*a // gcd(c, a)
abc = ab*c // gcd(ab, c)

ans = N//a + N//b + N//c
ans -= N//ab + N//bc + N//ca
ans += N//abc
print(ans)