from pip._vendor.distlib.compat import raw_input

N = str(raw_input()).split(sep=" ")

A = int(N[0])
B = int(N[1])
C = int(N[2])
i = 0

while True:
    if A+B <= C:
        C -= A+B-1
        i += A
    else:
        i += C
        print(i)
        break