import java.util.*;

public class Main {
    static final int MOD = 1000000007;
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long b = sc.nextLong() % MOD;
        long c = sc.nextLong() % MOD;
        long d = sc.nextLong();
        long[][] araay = new long[40][4];
        araay[0] = new long[]{c, b * c % MOD, 0, 1};
        for (int i = 1; i < 40; i++) {
            araay[i][0] = (araay[i - 1][0] * araay[i - 1][0] + araay[i - 1][1] * araay[i - 1][2]) % MOD;
            araay[i][1] = (araay[i - 1][0] * araay[i - 1][1] + araay[i - 1][1] * araay[i - 1][3]) % MOD;
            araay[i][2] = (araay[i - 1][2] * araay[i - 1][0] + araay[i - 1][3] * araay[i - 1][2]) % MOD;
            araay[i][3] = (araay[i - 1][2] * araay[i - 1][1] + araay[i - 1][3] * araay[i - 1][3]) % MOD;
        }
        long[] ans = new long[]{0, 1};
        for (int i = 39; i >= 0 && d > 0; i--) {
            if (d >= (1L << i)) {
                d -= (1L << i);
                long[] next = new long[2];
                next[0] = (araay[i][0] * ans[0] + araay[i][1] * ans[1]) % MOD;
                next[1] = (araay[i][2] * ans[0] + araay[i][3] * ans[1]) % MOD;
                ans = next;
            }
        }
        System.out.println(ans[0]);
    }
}