Evaluate Arithmetic Expression

Given a string representing a mathematical expression, evaluate it and output the result as an integer. The expression contains non-negative integers and the operators +, -, *, and /. The operator / represents integer division, and standard operator precedence applies: multiplication and division have higher precedence than addition and subtraction. In formulas, multiplication is denoted by \(\times\) and division by \(\div\).

For example, the expression:
$$3+5\times2$$
evaluates to 13.

inputFormat

The input consists of a single line containing a string expression without spaces. The string represents a valid arithmetic expression using non-negative integers and the operators +, -, *, and /.

outputFormat

Output a single integer which is the result of evaluating the expression. Note that division is performed as integer division.

3+5*2

13