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 ?



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






Problem Setter: Shahin ShamS