import math
def lcm(a, b):
    return (a * b) // math.gcd(a, b)

N = int(input())
a, b, c = map(int, input().split())
d = N//a + N//b + N//c -N//lcm(a, b) - N//lcm(b, c) - N//lcm(c, a) + N//lcm(lcm(a, b), c)
print(d)