import math
n=int(input())
a,b,c=map(int,input().split())
d = (a*b)//math.gcd(a,b)
e = (b*c)//math.gcd(b,c)
f = (c*a)//math.gcd(c,a)
g = (a*b*c//math.gcd(b,c))//(math.gcd(a,(b*c)//math.gcd(b,c)))
print(n//a + n//b + n//c - n//d - n//e - n//f + n//g)