import math

def gcd(a, b):
    while b!=0:
        a,b = b,a%b
    return a

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

def g(f=math.floor):
    n = int(input())
    a,b,c = map(int,input().split())
    return f(n/a)+f(n/b)+f(n/c)-f(n/lcm(a,b))-f(n/lcm(b,c))-f(n/lcm(c,a))+f(n/lcm(lcm(a,b),c))

print(g())