B - ISU

Time Limit: 2 sec / Memory Limit: 256 MB

### 問題文

X センチメートルの椅子があります。 この椅子に座りたい人がたくさんおり，人は椅子に座ると必ず Y センチメートルの幅を使って座ります。

### 制約

• 入力は全て整数
• 1 \leq X, Y, Z \leq 10^5
• Y+2Z \leq X

### 入力

X Y Z


### 入力例 1

13 3 1


### 出力例 1

3


### 入力例 2

12 3 1


### 出力例 2

2


### 入力例 3

100000 1 1


### 出力例 3

49999


### 入力例 4

64146 123 456


### 出力例 4

110


### 入力例 5

64145 123 456


### 出力例 5

109


Score : 200 points

### Problem Statement

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


### Sample Input 1

13 3 1


### Sample Output 1

3


There is just enough room for three, as shown below:

Figure

### Sample Input 2

12 3 1


### Sample Output 2

2


### Sample Input 3

100000 1 1


### Sample Output 3

49999


### Sample Input 4

64146 123 456


### Sample Output 4

110


### Sample Input 5

64145 123 456


### Sample Output 5

109