import math
from functools import reduce
def lcm(x,y): return (x*y)//math.gcd(x,y)
def lcms(*nums): return reduce(lcm,nums,1)
n=int(input())
a,b,c=map(int,input().split())
print(n//a+n//b+n//c-n//lcm(a,b)-n//lcm(b,c)-n//lcm(c,a)+n//lcms(a,b,c))