import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		sc.close();

		long answer = 0;
		for(int i = 1; i <= N; i++) {
			if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			}
		}

		System.out.println(answer);
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		sc.close();

		long answer = 0;
		for(int i = 1; i <= N; i++) {
			if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			}
		}

		System.out.println(answer);
	}
} Main public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		sc.close();

		long answer = 0;
		for(int i = 1; i <= N; i++) {
			if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			}
		}

		System.out.println(answer);
	} main {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		sc.close();

		long answer = 0;
		for(int i = 1; i <= N; i++) {
			if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			}
		}

		System.out.println(answer);
	} 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 answer = 0; answer 0 for(int i = 1; i <= N; i++) {
			if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			}
		} int i = 1; int i = 1; i 1 i <= N i N i++ i++ i {
			if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			}
		} {
			if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			}
		} if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			} i%3 != 0 i%3 i 3 0 {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			} if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				} i%5 != 0 i%5 i 5 0 {
					answer += i;
					//System.out.println(i);
				} answer += i answer i System.out.println(answer) System.out.println System.out System System.out answer String[] args args public class Main {
	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		sc.close();

		long answer = 0;
		for(int i = 1; i <= N; i++) {
			if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			}
		}

		System.out.println(answer);
	}
} public class Main {
	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		sc.close();

		long answer = 0;
		for(int i = 1; i <= N; i++) {
			if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			}
		}

		System.out.println(answer);
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		sc.close();

		long answer = 0;
		for(int i = 1; i <= N; i++) {
			if(i%3 != 0) {
				if(i%5 != 0) {
					answer += i;
					//System.out.println(i);
				}

			}
		}

		System.out.println(answer);
	}
}