class M{
  static int c(int[] a){
     for(Byte i = 1; i < a.length; a[0] += i.valueOf(a[i]+"", a[++i-2]));
     return a[0];
  }
 
  public static void main(String[] a){
    System.out.println(c(new int[]{ 4, 12, 34, 20, 14, 6, 25, 13, 33 }));
    System.out.println(c(new int[]{ 5, 14, 2, 11, 30, 18 }));
    System.out.println(c(new int[]{ 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 12, 2, 11, 3, 10, 2, 10 }));
    System.out.println(c(new int[]{ 36, 36 }));
  }
}

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