from math import gcd
def lcm(x,y):
    return x*y//gcd(x,y)

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

ANS=N//a+N//b+N//c-N//lcm(a,b)-N//lcm(b,c)-N//lcm(c,a)+N//lcm(lcm(a,b),c)

print(ANS)