import math
N = int(input())
a,b,c = [int(x) for x in input().split()]
ab = a*b//math.gcd( a,b)
bc = b*c//math.gcd( b,c)
ca = c*a//math.gcd( c,a)
abc=ab*c//math.gcd(ab,c)
n  = N//a  + N//b  + N//c  \
   - N//ab - N//bc - N//ca \
   + N//abc
print(n)