import java.util.*;
class Main
{
  public static void main(String[] args)
  {
    Scanner sc = new Scanner(System.in);
    
    int n = sc.nextInt();
    long sum = 0;
    
    for(int i=1 ; i<=n ; i++){
      
      if( (i%3!=0)&&(i%5!=0)){
      if(i%3!=0) {
      	if(i%5!=0){
      		
      	sum+=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