Problem: Alice is climbing stairs. There are total N stairs. She climbs A stairs upwards in day and she comes downstairs in night by B stairs. Find number of days she will take to reach the top of staircase.   

Input: 
First and only line contains three space separated integers denoting A, B, N.

Output: 
Print only one line of output denoting the answer to the question.

Constraints: 
1 ≤ B<A≤N ≤ 10^9

SAMPLE INPUT
5 1 6

SAMPLE OUTPUT
2

Solution (in PYTHON):

Solution:
import math
(a,b,n)=raw_input().split()
a=int(a)
b=int(b)
n=int(n)
d=(math.ceil (1.0*(n-b)/(a-b)))
print(int(d))