You are given 3 edge of a rectangle of length $a, b, c$. Print the length of the remaining edge.
### Input
- 3 integers $a, b, c$.
### Output
- The remainng edge's length.
### Constraints
- $(1 \le a, b, c \le 1000)$.
### Example
Input:
```4 3 4```
Output:
```3```
