9 530792195 6
 0 0 10
 1944219055 454183506 1369298327
 914835 2742837 9234739
 10 10 0
 2 2 0
 0 0 1
 3 10 1007169359
 0 1 0
 1016450951 2 9
 0 2 10
 2147483648 0 2147483647
 92134834 23742837 92374738
 1 4 3
 382601556 881329640 791556039
 0 0 58
 5 10 6
 10 6 8
 6 8 10
 3 2 0
 1 4 4
 2147483630 2147483642 2147483610
 1 0 0
 18 67 5
 50606342 2 1134945035
 8 97 83
 2147483648 0 0
 92134834 23742837 92374737
 5 0 5
 772486757 1747374885 377299255
 1 0 1
 1 2 3
 0 3 2
 2147483648 2147483647 2147483648
 51 10 91
 9214834 2742837 9234739
 1 2 2147483648
 67 81 1
 92134834 23742837 92374739
 2 7 95
 3 0 2
 5 9 0
 1 10 2
 246543403 71853598 1504509195
 2147483648 2147483648 2147483648
 48 6 7
 2147483648 2147483648 0
 1358352906 27037371 1947040615

                                                       530792195
                                                                0
                                                       1944219055
                                                          2742837
                                                               10
                                                                2
                                                                0
                                                       1007169359
                                                                0
                                                       1016450951
                                                                2
 2147483648                                                         92374738
                                                                3
                                                        881329640
                                                                0
                                                               10
                                                                8
                                                                8
                                                                2
                                                                4
                                                       2147483630
                                                                0
                                                               67
                                                         50606342
                                                               97
                                                                0
                                                         92374737
                                                                5
                                                        772486757
                                                                1
                                                                3
                                                                2
 2147483648                                                               91
                                                          9234739
 2147483648                                                               67
                                                         92374739
                                                               95
                                                                2
                                                                9
                                                               10
                                                       1504509195
 2147483648                                                               48
 2147483648                                                       1947040615

import java.util.Scanner;

public class Pixel {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        long i,j,k,n,a,b,c,big,middle,small,sum;
        boolean is;
        while (input.hasNext()){
            a = input.nextLong(); b = input.nextLong(); c = input.nextLong(); sum = 0; is = false;

            big = (a>=b) ? ((a>=c)? a :c) : ((b>=c) ? b : c);
            small = (a>=b) ? ((b>=c) ? c : b) : ((a>=c) ? c : a);
            middle = a>b ? (c>a ? a :(b>c)? b:c) : (c>b ? b : a>c? a : c);

           // System.out.println(big+ " " + middle + " " + small);
            for (i=0; i<big; i++){
                if (big == middle || big == small || middle == small) break;
                if ((middle - small ) % 2 == 0){
                   // big--;middle--;small++;
                    j = (middle - small);
                   // sum += (j/2);
                    sum += (small + j);
                    is = true;
                    break;
                }
                else break;
            }
            if (!is) {
                if (big == middle) sum += big;
                else if (big == small) sum += big;
                else if (small == middle) sum += small;
                else sum += big; System.out.println(sum);
            }
            else
            System.out.println(sum);
        }
    }
}
