#The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.
#Find the sum of all the primes below one million.

def getsum
  @sum=0
  a=(2..1_000_000).to_a
  while a.size>0
    @sum+=(pr=a[0])
    a.reject! {|k| k%pr==0}
    end
  end
  
require 'benchmark'
Benchmark.bm(30){|x| 
  x.report('results of getsum:') {getsum} }
puts @sum