The favorite of Sofia Belchonok lives on a very high tree at an altitude of h miles. He wants to pick up a nut in his hollow. During the day, he rises with a nut a miles, and during the night, the nut rolls down b miles. On what day does the squirrel raise the nut to its hollow?
It is forbidden to use any algorithmic constructs (if, while, for, etc.), except for arithmetic operations

Input: The program receives natural numbers h, a, b as input.
Output: The program should print one natural number. It is guaranteed that a> b.