A,B,C=[int(i) for i in input().split()]
base_cicle=C//(B+A-1)
base_price=base_cicle*(B+A-1)
base_year=base_cicle*A
next_price=C-base_price
if next_price<A-1:
    ans=base_year+next_price
else:
    ans=base_year+A
print(ans)