4.1 Input The first line of input will be a single integer N, representing the number of terms. The second line of input will be a single integer X, representing the value for X in the expression. The third line will be an mathematical expression with N terms. A term for the expression can be the following: integer X integer . A single integer Note that the first integer before X can be any valid integer. Each term is separated by an oper- ation, either - or +, with a single space before and after each operation. There is no whitespace in the terms themselves You can assume that the first term will always be positive, and that the exponents will 20 Also, there will only be one variable X. 4.2 Output Your output should be a single integer, positive or negative, representing the value of the entire expression. 4.3 Sample Input/Output Sample Input Sample out put 4.1 Input The first line of input will be a single integer N, representing the number of terms. The second line of input will be a single integer X, representing the value for X in the expression. The third line will be an mathematical expression with N terms. A term for the expression can be the following: integer X integer . A single integer Note that the first integer before X can be any valid integer. Each term is separated by an oper- ation, either - or +, with a single space before and after each operation. There is no whitespace in the terms themselves You can assume that the first term will always be positive, and that the exponents will 20 Also, there will only be one variable X. 4.2 Output Your output should be a single integer, positive or negative, representing the value of the entire expression. 4.3 Sample Input/Output Sample Input Sample out put