from math import gcd
N=int(input())
a,b,c=map(int,input().split())
ans=N//a+N//b+N//c
ans-=N//(a*b//gcd(a,b))
ans-=N//(b*c//gcd(b,c))
ans-=N//(c*a//gcd(c,a))
ans+=N//(a*b//gcd(a,b)*c//gcd(a*b//gcd(a,b),c))
print(ans)