import java.util.ArrayList;
import java.util.Arrays;

public class Abundant {
   public static int[] getAbundant(int limit) {
      ArrayList<Integer> abundant = new ArrayList<Integer>();
      for(int i=1;i<limit;i++) {
         if(sumDivisors(i) > i) {
            abundant.add(i);
         }
      }
      int[] result = new int[abundant.size()];
      for(int i=0;i<abundant.size();i++) {
         result[i] = abundant.get(i);
      }
      return result;
   }

   public static int sumDivisors(int num) {
      int sum = 1; //1 divides num
      for(int i=2;i*i<num;i++) {
         if(num % i == 0) {
            sum += i;
            sum += num / i;
         }
      }
      return sum;
   }

   public static void main(String[] args) {
      boolean[] sums = new boolean[28124];
      Arrays.fill(sums,false);
      int[] abundant = getAbundant(28124);
      //Set true to numbers writable as sums of abundant numbers
      for(int i=0;i<abundant.length;i++) {
         int p = abundant[i];
         for(int j=i;j<abundant.length && p+abundant[j] < sums.length;j++) {
            int index = p+abundant[j];
            sums[index] = true;
         }
      }
      //Check numbers whose entries in the array are false
      int sum = 0;
      for(int i=0;i<sums.length;i++) {
         if(!sums[i]) {
            sum += i;
         }
      }
      System.out.println(sum);
   }
}