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Ranald the cat was doing his P1 Math homework when he realised he has just lost his calculator! Without his calculator, he will not be able to complete his homework.

You, being the usual friendly & caring person, decided to be kaypo and help by coding a program to finish his homework. (:

You take the glance at his Math homework and noticed that all the questions are in the format of

<Number> <*Operator*> <Number>

You also took note that all the numbers were positive integers and there were only 3 types of operators: *+*, *-* and ***.

## Sample Input 1

5 - 3## Sample Output 1

2## Sample Input 2

7 * 7## Sample Output 2

49## Sample Input 3

13 + 4## Sample Output 3

17### Tags

### Subtasks and Limits

Subtask | Score | #TC | Time | Memory | Scoring |
---|---|---|---|---|---|

1 | 100 | 20 | 1s | 32MB | Average |

2 | 0 | 3 | 1s | 32MB | Average |

### Judge Compile Command

g++-8 ans.cpp -o calculator -Wall -Wshadow -static -O2 -lm -m64 -s -w -std=gnu++17 -fmax-errors=512