#include <bits/stdc++.h>

using namespace std;

long long countArray(int n, int k, int x) {
    int i;
    long long vastus = k - 1;
    long long xvoimalus = 1;
    if (x == 1) {
        xvoimalus = 0;
    }
    vastus %= 1000000007;
    for (i = 0; i < n - 2; i++) {
        xvoimalus = vastus - xvoimalus;
        if (xvoimalus < 0) {
            xvoimalus += 1000000007;
        }
        xvoimalus %= 1000000007;
        vastus *= k - 1;
        vastus %= 1000000007;
    }
    return xvoimalus;
}

int main() {
    int n;
    int k;
    int x;
    cin >> n >> k >> x;
    long long answer = countArray(n, k, x);
    cout << answer << endl;
    return 0;
}