p03548 AtCoder Beginner Contest 078 - ISU
We have a long seat of width X centimeters. There are many people who wants to sit here. A person sitting on the seat will always occupy an interval of length Y centimeters.

We would like to seat as many people as possible, but they are all very shy, and there must be a gap of length at least Z centimeters between two people, and between the end of the seat and a person.

At most how many people can sit on the seat?

Constraints

* All input values are integers.
* 1 \leq X, Y, Z \leq 10^5
* Y+2Z \leq X

Input

Input is given from Standard Input in the following format:


X Y Z


Output

Print the answer.

Examples

Input

13 3 1


Output

3


Input

12 3 1


Output

2


Input

100000 1 1


Output

49999


Input

64146 123 456


Output

110


Input

64145 123 456


Output

109
```python
x,y,z=map(int,input().split())
x-=z
print(x//(z+y))
```