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
'''
#print 'Hello World!'
i=0
c=0
s=raw_input()
li=[]
li=(s.split(" "))
u=int(li[0])
d=int(li[1])
t=int(li[2])
n=u-d;

c=int(t/n)
c=c+1
while(((n*c)+d)>=t):
      c=c-1
c=c+1

  
print(c)