import java.util.Scanner;

public class Main {
    private static final int[] a = new int[15];
    private static final int[] d = new int[15];
    static{
        int sum=0;
        int count = 0;
        for (int i = 0; i < 15; i++) {
            if(i%3!=0 && i%5!=0){
                sum+=i;
                count++;
            }
            a[i]=sum;
            d[i]=count;
        }
    }
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        System.out.println(f(n));
    }

    public static long f(int n){
        long b = n/15;
        int c = n%15;
        return b*(b-1)/2*15*8 + b*a[14] + a[c] + d[c]*b*15;
    }
}
/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