import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();

        long sum = 7;
        if (N <= 6) {
            if (N == 1) {
                System.out.println(1);
            } else if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            }

        } else {
            for (long i = 6; i <= N; i++) {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            }
            System.out.println(sum);
        }

    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();

        long sum = 7;
        if (N <= 6) {
            if (N == 1) {
                System.out.println(1);
            } else if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            }

        } else {
            for (long i = 6; i <= N; i++) {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            }
            System.out.println(sum);
        }

    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();

        long sum = 7;
        if (N <= 6) {
            if (N == 1) {
                System.out.println(1);
            } else if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            }

        } else {
            for (long i = 6; i <= N; i++) {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            }
            System.out.println(sum);
        }

    } main {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();

        long sum = 7;
        if (N <= 6) {
            if (N == 1) {
                System.out.println(1);
            } else if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            }

        } else {
            for (long i = 6; i <= N; i++) {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            }
            System.out.println(sum);
        }

    } 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 sum = 7; sum 7 if (N <= 6) {
            if (N == 1) {
                System.out.println(1);
            } else if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            }

        } else {
            for (long i = 6; i <= N; i++) {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            }
            System.out.println(sum);
        } N <= 6 N 6 {
            if (N == 1) {
                System.out.println(1);
            } else if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            }

        } if (N == 1) {
                System.out.println(1);
            } else if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            } N == 1 N 1 {
                System.out.println(1);
            } System.out.println(1) System.out.println System.out System System.out 1 if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            } N < 4 N 4 {
                System.out.println(3);
            } System.out.println(3) System.out.println System.out System System.out 3 {
                System.out.println(sum);
            } System.out.println(sum) System.out.println System.out System System.out sum {
            for (long i = 6; i <= N; i++) {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            }
            System.out.println(sum);
        } for (long i = 6; i <= N; i++) {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            } long i = 6; long i = 6; i 6 i <= N i N i++ i++ i {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            } {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            } if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                } i % 3 == 0 || i % 5 == 0 i % 3 == 0 i % 3 i 3 0 i % 5 == 0 i % 5 i 5 0 {
                    continue;
                } continue; 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) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();

        long sum = 7;
        if (N <= 6) {
            if (N == 1) {
                System.out.println(1);
            } else if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            }

        } else {
            for (long i = 6; i <= N; i++) {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            }
            System.out.println(sum);
        }

    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();

        long sum = 7;
        if (N <= 6) {
            if (N == 1) {
                System.out.println(1);
            } else if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            }

        } else {
            for (long i = 6; i <= N; i++) {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            }
            System.out.println(sum);
        }

    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();

        long sum = 7;
        if (N <= 6) {
            if (N == 1) {
                System.out.println(1);
            } else if (N < 4) {
                System.out.println(3);
            } else {
                System.out.println(sum);
            }

        } else {
            for (long i = 6; i <= N; i++) {
                if (i % 3 == 0 || i % 5 == 0) {
                    continue;
                }
                sum += i;
            }
            System.out.println(sum);
        }

    }
}
