import java.util.*;

class Main{
    public static void main(String args[]){
        Scanner cin = new Scanner(System.in);
        int target = cin.nextInt();
        
        int tmp = target;
        while(tmp>8){
            if(tmp==7){
            System.out.print(1);
            tmp=0;
            }else{
            tmp = tmp/7;
            System.out.print(tmp);
            }
        }
        System.out.println(tmp);
    }
}