func main()
	var ss: [][]char :: cui@input().split(" ")
	var x: int :: ss[0].toInt(&)
	var y: int :: ss[1].toInt(&)
	var z: int :: ss[2].toInt(&)
	var ans: int :: [(x + y + z) / 2, x + z, y + z].min()
	do cui@print("\{ans}\n")
end func