var z = readLine()!.split(separator: " ").map{Int($0)!}
if z[2] > 0{
    for _ in 1...z[2]{
        if z[0] < z[1]{
            z[0] += 1
        }else{
            z[1] += 1
        }
    }
}
print(z[0...1].min()!)