#from math import gcd
from math import gcd

def lcm(x,y):
    return x*y//gcd(x,y)

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

ab=lcm(a,b)
bc=lcm(b,c)
ca=lcm(c,a)
abc=lcm(lcm(a,b),c)

print(N//a + N//b + N//c - N//ab - N//bc - N//ca + N//abc)