Hi. Please take a look at my code. How can I count how many times someone add a number before someone hits - 1? Do you have any hints for me here? 
public class Solution {
    public static void main(String[] args) throws Exception {
        Scanner sc1 = new Scanner(System.in);
        int x;

        while (true) {
        x = sc1.nextInt();
        count ++;
        if (x==-1)
        break;

        }










    }
}