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import java.util.Scanner; public class Main{ //by Alarm Tran public static boolean isSimple(int n){ if(n>=0 && n<10){ return true; } return false; } public static int sumDigit(int n){ int s=0; while(n>0){ s+=n%10; n/=10; } return s; } public static void main(String[] args){ Scanner input = new Scanner(System.in); int n = input.nextInt(); if(isSimple(n)){ System.out.println(n/10); }else{ boolean check = isSimple(n); while(check==false){ int n1 = sumDigit(n); if(isSimple(n1)){ System.out.println(n1); check = isSimple(n1); }else{ n = n1; } } } } }
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