import java.util.Scanner;

public class Problem6 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

         String input = scanner.nextLine(); // 145
        char sum = 1;
        char totalSum = 0;

         for (int i = input.length()-1 ; i >=0 ; i--){ // 5
             int  num = Integer.parseInt("" + input.charAt(i));
             if (num == 0 ){
               sum += 0;
             }else {
                 while (num>=1){
                     sum *= num;
                     num--;
                 }
             }
            totalSum +=sum;
         }
         int nummm = Integer.parseInt(input);

         if (totalSum==nummm){
             System.out.println("yes");
         }else{
             System.out.println("no");
         }

    }
}