import java.util.*;

class Main
{
  public static void main(String[] args)
  {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    long[] num = new long[a];
    for (int i = 0; i < a; i++) {
      num[i] = i + 1;
    }
    
    long sum = 0;
    for (int i = 0; i < a; i++) {
      if (num[i] % 3 != 0 && num[i] % 5 != 0 && num[i] % 15 != 0) {
        sum += num[i];
      }
    }
    
    System.out.println(sum);
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz