program speedrun
  implicit none
  integer::X,Y,Z
  integer::ANS=0
  read*,X,Y,Z
  ANS=min(X,Y)
  X=X-ANS
  Y=Y-ANS
  ANS=ANS+min(max(X,Y),Z)
  Z=Z-min(max(X,Y),Z)
  ANS=ANS+max(0,Z/2)
  print"(i0)",ANS
end program speedrun