import java.util.*;

public class Main{
        public static void main(String[] args){
                try(Scanner sc = new Scanner(System.in)){
                        solve(sc.nextLong());
                        System.out.println("");
                }
        }
        private static void solve(long N){
                if(N==0){
                        return;
                }
                solve(N/7);
                System.out.print(N%7);
                return;
        }
}