def lcm(a, b):
    from fractions import gcd
    return (a * b) // gcd(a, b)

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

ans=0
ans+=n//a
ans+=n//b
ans+=n//c
ans+=n//lcm(lcm(a,b),c)
ans-=n//lcm(a,b)
ans-=n//lcm(b,c)
ans-=n//lcm(a,c)
print(ans)