PROGRAMMING:Mixed arithmetic
###Task description
```
The program outputs a result of four arithmetic expressions in the form of axbxc. For example: 1 + 2 * 3, 5 * 6 + 7, 100-50 / 5.
```
###Input format:
```
Include an expression in one line. There are two operators and three operands in the formula. Operators are guaranteed to be one of "+, -, *, /", and all operands are non negative integers. The division result is consistent with the integer division rule of C language, and the divisor is not zero in all test data.
```
###Output format:
Output the result of the formula.
###Input example:
```in
1+2*3
```
###Output example:
```out
seven
```
answer：If there is no answer, please comment
```
The program outputs a result of four arithmetic expressions in the form of axbxc. For example: 1 + 2 * 3, 5 * 6 + 7, 100-50 / 5.
```
###Input format:
```
Include an expression in one line. There are two operators and three operands in the formula. Operators are guaranteed to be one of "+, -, *, /", and all operands are non negative integers. The division result is consistent with the integer division rule of C language, and the divisor is not zero in all test data.
```
###Output format:
Output the result of the formula.
###Input example:
```in
1+2*3
```
###Output example:
```out
seven
```
answer：If there is no answer, please comment