n = gets
p,q,r = gets.split
np,nq,nr = n / p,n /q,n / r
npcq,nqcr,nrcp = n / (p * q),n / (q * r),n / (r * p)
npcqcr = n / (p * q * r)
puts np + nq + nr - npcq - nqcr - nrcp + npcqcr