from math import ceil,floor,sqrt,gcd,factorial 
def  lcm(a,b):
    return a*b // gcd(a,b)

n=int(input())
a,b,c = map(int,input().split())
z = [a]
if b%a:
    z.append(b)
if c%a and c%b:
    z.append(c)

if len(z) == 1:
    print(n//z[0])
elif len(z) == 2:
    a=z[0]
    b=z[1]
    print(n//a + n//b  - n//(lcm(a,b)))
else:
    a=z[0]
    b=z[1]
    c=z[2]
    print(n//a + n//b + n//c - n//(lcm(a,b)) - n//(lcm(a,c)) - n//(lcm(b,c)) + n//(lcm(lcm(a,b),c)))