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Problem
The program reads from standard input an arithmetic expression consisting of non-negative integers, the operators `+`, `-`, `*`, `/`, and (optionally) spaces. The expression contains no parentheses. The operator `/` denotes integer division (truncated toward zero), as in C/C++.
Print the value of the expression, computed following the usual precedence rules (`*` and `/` have higher precedence than `+` and `-`) and left-to-right associativity for operators of equal precedence.
Input format
Input
input.txt
The program reads from standard input a single line containing the expression. - The length of the expression is at most 200 characters. - Numbers in the expression are non-negative and have at most 9 digits. - The value of the expression and all intermediate sub-expressions fit in `long long`. - The operator `/` is integer division; the divisor is never zero.
Output format
Output
output.txt
The program prints to standard output a single integer: the value of the expression.
Example
input
12 * 3 + 4 - 6 / 2
output
37
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Sample cases (from the problem)
Sample Case 1
Input
12 * 3 + 4 - 6 / 2
Expected output
37
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