using System;
using System.IO;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;
using MethodImplOptions = System.Runtime.CompilerServices.MethodImplOptions;
using MethodImplAttribute = System.Runtime.CompilerServices.MethodImplAttribute;
public static class P {
  public static void Main() {
    int[] abc = Console.ReadLine().Split().Select(int.Parse).ToArray();
    int x = abc[0];
    int y = abc[1];
    int z = abc[2];
    int ans = Min(Min((x + y + z) / 2, x + z), y + z);
    Console.WriteLine(ans);
  }
}