99 100 100 100 100
 57 83 11 4 93
 99 99 99 99 99
 100 0 0 0 0
 0 1 2 3 4
 93 100 99 90 98
 87 38 19 33 100
 1 1 1 1 1
 0 0 0 0 1
 2 3 4 5 6
 1 2 1 2 3
 0 0 0 0 0
 100 100 100 100 100
 43 83 1 0 23
 43 83 1 100 23
 56 0 0 0 4
 99 98 98 99 100

-1
 -1
 99
 20
 2
 96
 -1
 1
 -1
 4
 -1
 -1
 100
 30
 50
 12
 -1

import java.util.Arrays;
import java.util.Scanner;
public class Main {
  public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
    long rgb[]=new long[4];
    for(int i=0;i<3;i++){
             rgb[i]=(sc.nextLong());
    }
   
    if((rgb[0]+rgb[1])*2<=rgb[2]) System.out.println(rgb[0]+rgb[1]); 
    else System.out.println((rgb[0]+rgb[1]+rgb[2])/3);
  }
}