from lang import clock

def is_prime(n)
  if n < 2 then return false end
  for i in 2..n
    if n % i == 0 then return false end
  end
  return true
end

start = clock()
N = 30000; primes = []
for i in 0..N
  if is_prime(i)
    list_append(primes, i)
  end
end
print("elapsed:", clock() - start, "s")