import java.util.*; public class Main{ public static int getS(int n){ int i,t=n; while(t>=10){ i=0; n=t; while(n>0){ i+=n%10; n/=10; } t=i; } return t; } public static void main(String args[]){ Scanner sc=new Scanner(System.in); int n=sc.nextInt(); System.out.print(getS(n)); } } /************************************************************** Problem: 1514 User: admin Language: Java Result: Accepted Time:939 ms Memory:39840 kb ****************************************************************/