import java.util.Scanner;

class Main {
	public static void main(String... args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		long somma = 0;
		for(int i=1; i<=N; ++i){
			if(i%3!=0 && i%5!=0) somma+=i;
		}
		System.out.print(somma);
	}
} import java.util.Scanner; Scanner java.util class Main {
	public static void main(String... args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		long somma = 0;
		for(int i=1; i<=N; ++i){
			if(i%3!=0 && i%5!=0) somma+=i;
		}
		System.out.print(somma);
	}
} Main public static void main(String... args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		long somma = 0;
		for(int i=1; i<=N; ++i){
			if(i%3!=0 && i%5!=0) somma+=i;
		}
		System.out.print(somma);
	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		long somma = 0;
		for(int i=1; i<=N; ++i){
			if(i%3!=0 && i%5!=0) somma+=i;
		}
		System.out.print(somma);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc long somma = 0; somma 0 for(int i=1; i<=N; ++i){
			if(i%3!=0 && i%5!=0) somma+=i;
		} int i=1; int i=1; i 1 i<=N i N ++i ++i i {
			if(i%3!=0 && i%5!=0) somma+=i;
		} {
			if(i%3!=0 && i%5!=0) somma+=i;
		} if(i%3!=0 && i%5!=0) somma+=i; i%3!=0 && i%5!=0 i%3!=0 i%3 i 3 0 i%5!=0 i%5 i 5 0 somma+=i somma i System.out.print(somma) System.out.print System.out System System.out somma String... args args
import java.util.Scanner;

class Main {
	public static void main(String... args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		long somma = 0;
		for(int i=1; i<=N; ++i){
			if(i%3!=0 && i%5!=0) somma+=i;
		}
		System.out.print(somma);
	}
}
