107 - Excavate Pond

Excavate Pond

Time Limit: 1 sec

**The Problem**

**X** persons need **D1** days to excavate a pond. How many additional persons must be employed if the pond is to be excavated in **D2** days ?

Example:

if **X** = 200, **D1** = 15 and **D2** = 10 then

100 additional persons must be employed.

**The Input**

The input file contains only 3 integer numbers **X** , **D1 **and **D2 **(**X**<=1000, **D1**<=365, **D2**<=365 and **D2 **< **D1**).

**The Output**

Output will show the one integer number which is additional persons must be employed in a separate line.

**Sample Input**

200 15 10

**Sample Output**

100

Problem Setter: Shahin ShamS