def gcd(a,b):
    while b!=0:
        a,b=b,a%b
    return a
def lcm(a,b):
    return a*b//gcd(a,b)

m=int(input())
a,b,c=sorted(list(map(int, input().split())))
s=0
s+=int(m/a)
s+=int(m/b)
s+=int(m/c)
lcmbc=lcm(b,c)
s-=int(m/lcm(a,b))
s-=int(m/lcm(a,c))
s-=int(m/lcmbc)
s+=int( m/( lcm(a,lcmbc)  ))
print(s)