//*******************************************************************
// NOTE: please read the 'More Info' tab to the right for shortcuts.
//*******************************************************************
 
import java.lang.Math; // headers MUST be above the first class
import java.util.Scanner;
 
// one class needs to have a main() method
public class HelloWorld
{
  public static void main(String[] args) {
   System.out.println("Enter the scores:");
    Scanner scanner = new Scanner(System.in);
    int n = scanner.nextInt();
    int total = 0;
    int count = 0;
    while (n != -1) {
      total += n;
      count++;
      n = scanner.nextInt();
    }
    int calc = (total / count);
    System.out.println(calc);
  }
}

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