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# from http://www.bagley.org/~doug/shootout/bench/sieve/sieve.ruby
num = 500
count = i = j = 0
flags0 = Array.new(8192,1)
k = 0
while k < num
k += 1
count = 0
flags = flags0.dup
i = 2
while i<8192
i += 1
if flags[i]
# remove all multiples of prime: i
j = i*i
while j < 8192
j += i
flags[j] = nil
end
count += 1
end
end
end
count
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