public class TresBucles {
  public static void main (String[] args) {

  int[] array = {2, 6, 10, 7, 9, 5, 4, 2, 5, 1, 7, 5, 2};
  int i = 0;

  //BUCLE 1
  for (i = 0; i < array.length ; i++) {
    int suma = array[i] + array[i + 1];
    System.out.println(suma);
  }

  //BUCLE 2
  int compta = 0;
  i = 0;
  while (compta < 2) {
    if (array[i] == 7) {
      compta++;
    }
    i++;
  }
  System.out.println(compta);

  //BUCLE 3
  int acum = 0;
  i = 0;
  while ((acum < 20)&&(i < array.length)) {
    acum = acum + array[i];
    i++;
  }
  System.out.println(acum);

  }
}