Submission #14942722

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N = gets.to_i
s=k=0;n=N
while k<n
  k += 1
  n = N/k
  s += k*n*(n+1)
end
knn = k*n*(n+1)/2
s -= (k+1)*knn/2
s -= knn if n<k
p s
 
 
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N = gets.to_i

s=k=0;n=N
while k<n
	k += 1
	n = N/k
	s += k*n*(n+1)
end
knn = k*n*(n+1)/2
s -= (k+1)*knn/2
s -= knn if n<k

p s

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