function isqrt (r : int) : int
var low : int
var high : int
var mid : int
begin
	printStr("starting")
	low = 0
	high = r
	while (high > low + 1) do
	begin
		printStr("values")
		mid = (low + high) / 2
		printInt(low)
		printInt(mid)
		printInt(high)
		if ((mid * mid) > r) then
			high = mid
		else
			low = mid
	end
	printStr("returning")
	return (low)
end

function main ()
begin
	printInt(isqrt(10820))
end