func main()
	var _: [][]char :: cui@input().split(" ")
	var x: int :: _[0].toInt(&)
	var y: int :: _[1].toInt(&)
	var r: int :: _[2].toInt(&)
	var ans: int :: x.abs() + y.abs() + (r $ float * lib@sqrt(2.0) + 1.0) $ int
	do cui@print("\{ans}")
end func