#include <cstdio>
#include <cstdint>

constexpr intmax_t MOD = 1e9+7;

intmax_t modpow(intmax_t base, intmax_t iexp) {
  intmax_t res = 1;
  for (intmax_t dbl = base; iexp; iexp >>= 1) {
    if (iexp & 1) res = res * dbl % MOD;
    dbl = dbl * dbl % MOD;
  }
  return res;
}

intmax_t modinv(intmax_t n) {
  return modpow(n, MOD-2);
}

intmax_t moddiv(intmax_t m, intmax_t n) {
  return m * modinv(n) % MOD;
}

intmax_t modsub(intmax_t m, intmax_t n) {
  m -= n;
  if (m < 0) m += MOD;
  return m;
}

int main() {
  intmax_t B, C, D;
  scanf("%jd %jd %jd", &B, &C, &D);
  B %= MOD;
  C %= MOD;

  if (C == 1)
    return !printf("%jd\n", B * (D % MOD) % MOD);

  intmax_t Cn = modpow(C, D+1);
  printf("%jd\n", modsub(modsub(Cn, 1) * moddiv(B, modsub(C, 1)) % MOD, B));
}