def inv(x):
    return pow(x, MOD-2, MOD)
    
B, C, D = map(int, input().split())
MOD = 10 ** 9 + 7

if C == 1:
    print(B * D % MOD)
else:
    print(((B * C * (pow(C, D, MOD) - 1)) % MOD) * inv(C-1) % MOD)