a, b, t = list(map(int, input().split(" ")))
tt = t
binary = "{0:b}".format(t)

v = 1
vv = (int(0.5*(a+b))) % (10**9 + 7)
while t > 0:
    if t % 2 == 1:
        v *= vv
        v = v % (10**9 + 7)
    t = t//2
    vv = vv**2 
    vv = vv % (10**9 + 7)

print(int(v))