Calculator#1427
Vasya is a student who has a younger brother, Petya. Petya has just started first grade and began learning arithmetic. For homework, he was given many addition and subtraction problems. Petya asked Vasya to check his work. Seeing two pages full of problems, Vasya was shocked by the amount of work and decided to teach Petya to use a computer for self-checking. To do this, Vasya decided to write a program that calculates the answers to the arithmetic problems.
One line contains digits and the symbols '' and ''. The length of the line does not exceed 10^4, and the value of each number in the line does not exceed 10^4.
Print one integer — the result of the calculation.
Example 1