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

#import fractions
import math
from functools import reduce
def lcm_base(x, y):
  #return (x * y) // fractions.gcd(x, y)
  return (x * y) // math.gcd(x, y)

def lcm_list(numbers):
  return reduce(lcm_base, numbers, 1)

ans = n//a + n//b + n//c
ans -= n//lcm_base(a, b) + n//lcm_base(b, c) + n//lcm_base(c, a)
ans += n//lcm_list([a, b, c])

print(ans)