#include <bits/stdc++.h>
using namespace std;

using int64 = long long;
using uint64 = unsigned long long;

const int64 MOD = 1e9 + 7;

int main()
{
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int64 B, C, D;
    cin >> B >> C >> D;

    B %= MOD;
    C %= MOD;

    int64 ans = 0, powC = C,
          cum = 1,
          sum = C;  // c + c^2 + ... + c^{2^m}

    while (D > 0)
    {
        if (D & 1)
        {
            (ans += cum * sum) %= MOD;
            (cum *= powC) %= MOD;
        }

        sum = (sum + powC * sum) % MOD; 
        (powC *= powC) %= MOD;
        D >>= 1;
    }

    (ans *= B) %= MOD;

    cout << ans << endl;

    return 0;
}