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:
A, B, N = map(int, raw_input().split(' '))
X = (N - A) / (A - B) + 1
if (N - A) % (A - B) > 0:
	X = X + 1
print(X)