As a shopkeeper of a restaurant,everyday ,dandelion's mother needs to calculate the incomes.Sometimes,she may make some mistakes.So dandelion wants you to write a program to help her calculate the value of some expressions.
You may consider every expression is made of :left parenthesis '(' ,right parenthesis ')' , plus sign '+' , subtraction sign '-' , multiplication sign '*' ,positive sign '+' ,and negative sign '-'.There is no precursor 0.The length of expression will not exceed 100.The value produced during the calculating will not exceed 10^9.Every expression is legal.Ie. ((10+(-100))) ，-（-1），-3*(+5+7*2)-(0) ，-0 ，(-3)*(-5+7) are legal,while 1+-7 ，--3+8 ，-3+() are illegal.