X, Y, Z = gets.split.map(&:to_i)

ok = 0
ng = 10 ** 9

def f(x)
  z = Z

  if X < x
    z -= x - X
  end

  if Y < x
    z -= x - Y
  end

  z >= 0
end

while (ok - ng).abs > 1
  x = (ok + ng) / 2

  if f(x)
    ok = x
  else
    ng = x
  end
end

puts ok