Predict the output of the following code.

public class Main
{
  public static void main(String[] args)
  {
  int[] arr1={5,6,3,1,2};
  int n=arr1.length+1;
        int s=n*(n+1)/2;
        int r=0;
        for (int i = 0; i < arr1.length; i++) {
            r+=arr1[i];
        }
        int f=s-r;
        System.out.println(f);
    }
} 

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