b,c,d = map(int,input().split())

import sys
P = 10 ** 9 + 7

if c == 1:
    print(b * d % P)
else:
    t = pow(c,d,P) - 1
    inv = (c - 1,P-2,P)
    ans = t * inv * b * c % P
    print(ans)