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:
'''
# Read input from stdin and provide input before running code

name = raw_input('What is your name?\n')
print 'Hi, %s.' % name
'''
A,B,N=map(int,raw_input().split())
numberofstairs=0
count=0
'''while N > numberofstairs:
	if count%2==0:
		numberofstairs+=A
	else:
		numberofstairs-=B
	count+=1
if count%2==0:
	print count
else:
	print count/2+count%2'''
if (N-B)%(A-B)==0:
	print (N-B)/(A-B)
else:
	print (N-B)/(A-B)+1