a, b, c = [ int (v) for v in input().split() ]

def getmoney(y):
	u = y // a
	v = y + (b-1) * u 
	return v

stop = 0

high = c
low = 1
mid = (high + low) // 2
t = 0
anslist = []

while stop == 0:
	anslist.append(mid)
 
	if getmoney(mid) == c:
		stop = 1
		ans = mid
	elif getmoney(mid) > c:
		high = mid
		mid = (high + low) // 2
	else:
		low = mid
		mid = (high + low) // 2

	
	if len(anslist)> 4 and [anslist[-1],anslist[-2]] == [anslist[-3],anslist[-4]]:
		stop = 1
if getmoney(anslist[-1]) < c:
	print(anslist[-1]+1)
else:
	print(anslist[-1])