In a blackboard, it's written the following expression1−2−22−23−24−25−26−27−28−29−210We put parenthesis by different ways and then we calculate the result. For example:1−2−(22−23)−24−(25−26−27)−28−(29−210)=403 and1−(2−22(−23−24)−(25−26−27))−(28−29)−210=−933How many different results can we obtain?