local read, write = io.read, io.write
local num, nl = '*n', '\n'
local a = read(num)
local x = a
local i = 0
local j = 0
while i<x/2 do
while j < i do
if i % j then
ans=ans+i
end
j = j + 1
end
i = i + 1
end
if ans = x then
write(ans, ln)
end
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