import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        long N = sc.nextInt();
        long sum = 0;
        for(int i=1;i<=N;i++)
        {
            if(i%3!=0) sum = sum + i;
            if(i%5!=0) sum = sum + i;
            if(i%15!=0) sum = sum - i;
            
        }
        System.out.println(sum);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        long N = sc.nextInt();
        long sum = 0;
        for(int i=1;i<=N;i++)
        {
            if(i%3!=0) sum = sum + i;
            if(i%5!=0) sum = sum + i;
            if(i%15!=0) sum = sum - i;
            
        }
        System.out.println(sum);
    }
} Main public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        long N = sc.nextInt();
        long sum = 0;
        for(int i=1;i<=N;i++)
        {
            if(i%3!=0) sum = sum + i;
            if(i%5!=0) sum = sum + i;
            if(i%15!=0) sum = sum - i;
            
        }
        System.out.println(sum);
    } main {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        long N = sc.nextInt();
        long sum = 0;
        for(int i=1;i<=N;i++)
        {
            if(i%3!=0) sum = sum + i;
            if(i%5!=0) sum = sum + i;
            if(i%15!=0) sum = sum - i;
            
        }
        System.out.println(sum);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long N = sc.nextInt(); N sc.nextInt() sc.nextInt sc long sum = 0; sum 0 for(int i=1;i<=N;i++)
        {
            if(i%3!=0) sum = sum + i;
            if(i%5!=0) sum = sum + i;
            if(i%15!=0) sum = sum - i;
            
        } int i=1; int i=1; i 1 i<=N i N i++ i++ i {
            if(i%3!=0) sum = sum + i;
            if(i%5!=0) sum = sum + i;
            if(i%15!=0) sum = sum - i;
            
        } {
            if(i%3!=0) sum = sum + i;
            if(i%5!=0) sum = sum + i;
            if(i%15!=0) sum = sum - i;
            
        } if(i%3!=0) sum = sum + i; i%3!=0 i%3 i 3 0 sum = sum + i sum sum + i sum i if(i%5!=0) sum = sum + i; i%5!=0 i%5 i 5 0 sum = sum + i sum sum + i sum i if(i%15!=0) sum = sum - i; i%15!=0 i%15 i 15 0 sum = sum - i sum sum - i sum i System.out.println(sum) System.out.println System.out System System.out sum String[] args args public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        long N = sc.nextInt();
        long sum = 0;
        for(int i=1;i<=N;i++)
        {
            if(i%3!=0) sum = sum + i;
            if(i%5!=0) sum = sum + i;
            if(i%15!=0) sum = sum - i;
            
        }
        System.out.println(sum);
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        long N = sc.nextInt();
        long sum = 0;
        for(int i=1;i<=N;i++)
        {
            if(i%3!=0) sum = sum + i;
            if(i%5!=0) sum = sum + i;
            if(i%15!=0) sum = sum - i;
            
        }
        System.out.println(sum);
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        long N = sc.nextInt();
        long sum = 0;
        for(int i=1;i<=N;i++)
        {
            if(i%3!=0) sum = sum + i;
            if(i%5!=0) sum = sum + i;
            if(i%15!=0) sum = sum - i;
            
        }
        System.out.println(sum);
    }
}
