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);
  
  }
}