public class MyClass {
    public static void main(String args[]) {
        java.util.Scanner scanner = new java.util.Scanner(System.in);
        int factorial = 1;
        String input = scanner.nextLine();
        int number = 1;
        int endSum = 0;
        int inputInt = Integer.valueOf(input);
        String result = null;
        for (int p = 0; p < input.length();p++) {
            number = Character.getNumericValue(input.charAt(p));
            for (int i = 1; i <= number; i++) {
                factorial=factorial* i;
            } // calculate a singular digit factorial
            endSum+=factorial;
            factorial = 1; // reset single digit factorial calculcation for next digit
        }
        if (endSum == inputInt) {
            result = "yes";
        } else {
            result = "no";
        }
        System.out.println(result);
    }
}