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 = raw_input().split()
A,B,N = int(A), int(B),int(N)
from math import ceil
if N <= A :
	print 1
elif N - A < A:
	print 3
else:
	N1 = N - A - 1
	c = A - B
	print int(ceil(N1/c)) + 2