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

def my_lcm(*numbers):
    return reduce(my_lcm_base, numbers, 1)
n=int(input())
a,b,c=map(int,input().split())
x=my_lcm_base(a,b)
y=my_lcm_base(b,c)
z=my_lcm_base(a,c)
l=[a,b,c]
p=my_lcm(*l)

print(n//a+n//b+n//c-n//x-n//y-n//z+n//p)