	
	


import java.util.*; 
	public class Main {
	public static void main( String[] args) {			
					
					Scanner in = new Scanner(System.in);
					long a = in.nextInt();
					long s = 0;
					
					for(long i = 1;i<=a;i++) {
						if(i%3==0||i%5==0) {
							continue;
						}
						else {
							s = s+i;
						}
					}
					System.out.println(s);
					
			}}
/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