import math
N=int(input())
a,b,c=map(int,input().split())
def lcm(x,y):
    return x*y//math.gcd(x,y)
ans=0
ans+=N//a
ans+=N//b
ans+=N//c
ans-=N//lcm(a,b)
ans-=N//lcm(b,c)
ans-=N//lcm(c,a)
ans+=N//lcm(lcm(a,b),c)
print(ans)