import algorithm, sequtils, strutils

var rgb = stdin.readLine.split.map parseInt
sort rgb
var (a, b, c) = (rgb[0], rgb[1], rgb[2])
let x = min(b-a, (c - b) div 2)
a.inc x
b.dec a
c.dec x * 2 + a

if b == 0:
  echo a + c div 5
else:
  echo a + (b + c) div 8 * 2 + (b + c) mod 8 div 5