func main()
	var n: int :: cui@inputInt()
	if(n = 1)
		do cui@print("0\n")
		ret
	end if
	var ans: int :: 0
	var a: []int :: math@primeFactors(n)
	for i(0, ^a - 1)
		do ans :+ a[i]
	end for
	do cui@print("\{ans}\n")
end func