#!/usr/bin/python
from fractions import gcd
lcm = lambda a, b: a * b / gcd(a, b)
lcmx = lambda *arr: reduce(lcm, arr)

n = int(raw_input())
a, b, c = map(int, raw_input().split())
res = n/a + n/b + n/c - n/lcm(a, b) - n/lcm(b, c) - n/lcm(c, a) + n/lcmx(a, b, c)
print res