Competitions

# Lesson 6. October 8 - 14. Char arrays

# Calculator

The student Vasya has a younger brother Peter, who went to the first class and started to learn arithmetic. At home in the first class he was asked to solve many problems using addition and subtraction. Peter asked Vasya to check the homework. Seeing the two-page written scrawl tests, Vasya was horrified by the amount of work and decided to teach Peter to use a computer for self checking. To do this, Vasya needs to write a program that computes the answers for the required arithmetic problems.

#### Input

One line that contains numbers and symbols «+» and «-». The length of the line does not exceed **10000** symbols, the values of all numbers are not greater than **10000**.

#### Output

Print one integer - the result of calculation.

Input example #1

1+22-3+4-5+123

Output example #1

142