import java.util.Scanner;

public class Main {

    public static void main(String[] args) throws Exception {

//    	File file = new File("test.txt");
//    	Scanner sc = new Scanner(file);
    	Scanner sc = new Scanner(System.in);
    	int N = sc.nextInt();
    	sc.close();
    	long ans = 0;
    	for(int i = 1; i <= N; i++){
    		if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		}
    	}
    	System.out.println(ans);
    }
} import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String[] args) throws Exception {

//    	File file = new File("test.txt");
//    	Scanner sc = new Scanner(file);
    	Scanner sc = new Scanner(System.in);
    	int N = sc.nextInt();
    	sc.close();
    	long ans = 0;
    	for(int i = 1; i <= N; i++){
    		if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		}
    	}
    	System.out.println(ans);
    }
} Main public static void main(String[] args) throws Exception {

//    	File file = new File("test.txt");
//    	Scanner sc = new Scanner(file);
    	Scanner sc = new Scanner(System.in);
    	int N = sc.nextInt();
    	sc.close();
    	long ans = 0;
    	for(int i = 1; i <= N; i++){
    		if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		}
    	}
    	System.out.println(ans);
    } main {

//    	File file = new File("test.txt");
//    	Scanner sc = new Scanner(file);
    	Scanner sc = new Scanner(System.in);
    	int N = sc.nextInt();
    	sc.close();
    	long ans = 0;
    	for(int i = 1; i <= N; i++){
    		if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		}
    	}
    	System.out.println(ans);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc sc.close() sc.close sc long ans = 0; ans 0 for(int i = 1; i <= N; i++){
    		if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		}
    	} int i = 1; int i = 1; i 1 i <= N i N i++ i++ i {
    		if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		}
    	} {
    		if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		}
    	} if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		} i % 3 != 0 && i % 5 != 0 i % 3 != 0 i % 3 i 3 0 i % 5 != 0 i % 5 i 5 0 {
    			ans+=i;
    		} ans+=i ans i System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {

    public static void main(String[] args) throws Exception {

//    	File file = new File("test.txt");
//    	Scanner sc = new Scanner(file);
    	Scanner sc = new Scanner(System.in);
    	int N = sc.nextInt();
    	sc.close();
    	long ans = 0;
    	for(int i = 1; i <= N; i++){
    		if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		}
    	}
    	System.out.println(ans);
    }
} public class Main {

    public static void main(String[] args) throws Exception {

//    	File file = new File("test.txt");
//    	Scanner sc = new Scanner(file);
    	Scanner sc = new Scanner(System.in);
    	int N = sc.nextInt();
    	sc.close();
    	long ans = 0;
    	for(int i = 1; i <= N; i++){
    		if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		}
    	}
    	System.out.println(ans);
    }
} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) throws Exception {

//    	File file = new File("test.txt");
//    	Scanner sc = new Scanner(file);
    	Scanner sc = new Scanner(System.in);
    	int N = sc.nextInt();
    	sc.close();
    	long ans = 0;
    	for(int i = 1; i <= N; i++){
    		if(i % 3 != 0 && i % 5 != 0){
    			ans+=i;
    		}
    	}
    	System.out.println(ans);
    }
}