#include <bits/stdc++.h>
using namespace std;
template <class F> class y_combinator {
    F f;

   public:
    y_combinator(F&& f) : f(std::forward<F>(f)) {}
    template <class... Args> auto operator()(Args&&... args) const { return f(*this, std::forward<Args>(args)...); }
};
using ll = long long;
using ld = long double;
template <class T, class U = std::less<T>> using prique = std::priority_queue<T, std::vector<T>, U>;
template <class T> T floor(T a, T b) noexcept { return a / b - (a % b && (a ^ b) < 0); }
template <class T> T ceil(T a, T b) noexcept { return floor(a + b - 1, b); }
template <class T> bool chmin(T& x, const T& y) noexcept { return (x > y ? x = y, true : false); }
template <class T> bool chmax(T& x, const T& y) noexcept { return (x < y ? x = y, true : false); }
#define overload4(a, b, c, d, e, ...) e
#define rep1(a) for (long long _i = 0; _i < (a); _i++)
#define rep2(i, a) for (long long i = 0; i < (a); i++)
#define rep3(i, a, b) for (long long i = (a); i < (b); i++)
#define rep4(i, a, b, c) for (long long i = (a); i < (b); i += (c))
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define rrep(i, a, b, c) for (long long i = (a); i > (b); i += (c))
#define all(x) std::begin(x), std::end(x)
#define rall(x) std::rbegin(x), std::rend(x)
#define pb push_back
#ifndef LOCAL
#define debug(...)
#endif
const int md = 1e9 + 7;
using S = array<array<ll, 2>, 2>;
S op(S a, S b) {
    S e{};
    rep(i, 2) rep(k, 2) rep(j, 2) {
        e[i][j] += a[i][k] * b[k][j];
        e[i][j] %= md;
    }
    return e;
}
S pow(S a, ll n) {
    S e{};
    rep(i, 2) e[i][i] = 1;
    while (n) {
        if (n & 1) e = op(e, a);
        a = op(a, a);
        n >>= 1;
    }
    return e;
}
void run_case() {
    ll B, C, D;
    cin >> B >> C >> D;
    B %= md, C %= md;
    S a{};
    const ll BC = (B * C) % md;
    a[0][0] = C, a[0][1] = BC, a[1][0] = 0, a[1][1] = 1;
    a = pow(a, D - 1);
    ll ans = a[0][0] * BC;
    ans %= md;
    ans += a[0][1];
    ans %= md;
    cout << ans << endl;
}

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    std::fixed(std::cout).precision(16);
    int T = 1;
    // cin >> T;
    while (T--) run_case();
    return 0;
}