first try yourself if stuck then apply this solution

package en.codegym.task.pro.task04.task0403; import java.util.Scanner; /* Summation */ public class Solution { public static void main(String[] args) { //write your code here Scanner sc = new Scanner(System.in); int sum = 0; boolean flag = true; while(flag){ String str = sc.nextLine(); if(str.equals("ENTER")) { flag=false; }else{ int num = Integer.parseInt(str); sum +=num; } } System.out.println(sum); } }