def main():
    B, C, D = map(int, input().split())

    mod = 1000000007
    if C == 1:
        print(B % mod * D % mod)
        return

    a = ((B * C) % mod * pow(C, D, mod) - (B * C) % mod) % mod
    ans = a * pow((C - 1), mod - 2, mod) % mod
    print(ans)

main()