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