local read, write = io.read, io.write
local b=2
local n, sum = 1,0
while n <= 100 do
	sum = 0
	b = 2
	while b <= n do
		if b%n == 0 then 
			sum = sum + b
		end
		b = b+1
	end

	if sum == n then write(n)
	end
end