import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
//        Scanner scanner = new Scanner(System.in);
//        boolean hasNextInt = scanner.hasNextInt();
//        int x = scanner.nextInt();
//        if(hasNextInt) {
//            while(x > 0) {
//                if(x % 10 == 7) {
//                    System.out.println("Yes");
//                    break;
//                } else {
//                    x /= 10;
//                }
//                if(x == 0) {
//                    System.out.println("No");
//                }
//            }
//        }
//        scanner.close();

        Scanner scanner = new Scanner(System.in);
        boolean hasNextInt = scanner.hasNextInt();
        int n = scanner.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } if(i == n) {
                System.out.println(sum);
                break;
            }
        }
        scanner.close();
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
//        Scanner scanner = new Scanner(System.in);
//        boolean hasNextInt = scanner.hasNextInt();
//        int x = scanner.nextInt();
//        if(hasNextInt) {
//            while(x > 0) {
//                if(x % 10 == 7) {
//                    System.out.println("Yes");
//                    break;
//                } else {
//                    x /= 10;
//                }
//                if(x == 0) {
//                    System.out.println("No");
//                }
//            }
//        }
//        scanner.close();

        Scanner scanner = new Scanner(System.in);
        boolean hasNextInt = scanner.hasNextInt();
        int n = scanner.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } if(i == n) {
                System.out.println(sum);
                break;
            }
        }
        scanner.close();
    }
} Main public static void main(String[] args) {
//        Scanner scanner = new Scanner(System.in);
//        boolean hasNextInt = scanner.hasNextInt();
//        int x = scanner.nextInt();
//        if(hasNextInt) {
//            while(x > 0) {
//                if(x % 10 == 7) {
//                    System.out.println("Yes");
//                    break;
//                } else {
//                    x /= 10;
//                }
//                if(x == 0) {
//                    System.out.println("No");
//                }
//            }
//        }
//        scanner.close();

        Scanner scanner = new Scanner(System.in);
        boolean hasNextInt = scanner.hasNextInt();
        int n = scanner.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } if(i == n) {
                System.out.println(sum);
                break;
            }
        }
        scanner.close();
    } main {
//        Scanner scanner = new Scanner(System.in);
//        boolean hasNextInt = scanner.hasNextInt();
//        int x = scanner.nextInt();
//        if(hasNextInt) {
//            while(x > 0) {
//                if(x % 10 == 7) {
//                    System.out.println("Yes");
//                    break;
//                } else {
//                    x /= 10;
//                }
//                if(x == 0) {
//                    System.out.println("No");
//                }
//            }
//        }
//        scanner.close();

        Scanner scanner = new Scanner(System.in);
        boolean hasNextInt = scanner.hasNextInt();
        int n = scanner.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } if(i == n) {
                System.out.println(sum);
                break;
            }
        }
        scanner.close();
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) boolean hasNextInt = scanner.hasNextInt(); hasNextInt scanner.hasNextInt() scanner.hasNextInt scanner int n = scanner.nextInt(); n scanner.nextInt() scanner.nextInt scanner long sum = 0; sum 0 for (int i = 1; i <= n; i++) {
            if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } if(i == n) {
                System.out.println(sum);
                break;
            }
        } int i = 1; int i = 1; i 1 i <= n i n i++ i++ i {
            if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } if(i == n) {
                System.out.println(sum);
                break;
            }
        } {
            if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } if(i == n) {
                System.out.println(sum);
                break;
            }
        } if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } i % 3 != 0 && i % 5 != 0 i % 3 != 0 i % 3 i 3 0 i % 5 != 0 i % 5 i 5 0 {
                sum += i;
            } sum += i sum i if(i == n) {
                System.out.println(sum);
                break;
            } i == n i n {
                System.out.println(sum);
                break;
            } System.out.println(sum) System.out.println System.out System System.out sum break; scanner.close() scanner.close scanner String[] args args public class Main {
    public static void main(String[] args) {
//        Scanner scanner = new Scanner(System.in);
//        boolean hasNextInt = scanner.hasNextInt();
//        int x = scanner.nextInt();
//        if(hasNextInt) {
//            while(x > 0) {
//                if(x % 10 == 7) {
//                    System.out.println("Yes");
//                    break;
//                } else {
//                    x /= 10;
//                }
//                if(x == 0) {
//                    System.out.println("No");
//                }
//            }
//        }
//        scanner.close();

        Scanner scanner = new Scanner(System.in);
        boolean hasNextInt = scanner.hasNextInt();
        int n = scanner.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } if(i == n) {
                System.out.println(sum);
                break;
            }
        }
        scanner.close();
    }
} public class Main {
    public static void main(String[] args) {
//        Scanner scanner = new Scanner(System.in);
//        boolean hasNextInt = scanner.hasNextInt();
//        int x = scanner.nextInt();
//        if(hasNextInt) {
//            while(x > 0) {
//                if(x % 10 == 7) {
//                    System.out.println("Yes");
//                    break;
//                } else {
//                    x /= 10;
//                }
//                if(x == 0) {
//                    System.out.println("No");
//                }
//            }
//        }
//        scanner.close();

        Scanner scanner = new Scanner(System.in);
        boolean hasNextInt = scanner.hasNextInt();
        int n = scanner.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } if(i == n) {
                System.out.println(sum);
                break;
            }
        }
        scanner.close();
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
//        Scanner scanner = new Scanner(System.in);
//        boolean hasNextInt = scanner.hasNextInt();
//        int x = scanner.nextInt();
//        if(hasNextInt) {
//            while(x > 0) {
//                if(x % 10 == 7) {
//                    System.out.println("Yes");
//                    break;
//                } else {
//                    x /= 10;
//                }
//                if(x == 0) {
//                    System.out.println("No");
//                }
//            }
//        }
//        scanner.close();

        Scanner scanner = new Scanner(System.in);
        boolean hasNextInt = scanner.hasNextInt();
        int n = scanner.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 != 0 && i % 5 != 0) {
                sum += i;
            } if(i == n) {
                System.out.println(sum);
                break;
            }
        }
        scanner.close();
    }
}