MOD = 10 ** 9 + 7
B, C, D = map(int, input().split())
if (C - 1) % MOD == 0:
    print((B * D) % MOD)
else:
    bc = - B * pow(C - 1, -1, MOD)
    print((C * (pow(C, D - 1, MOD) * (B - bc) + bc)) % MOD)