#include <bits/stdc++.h>

using namespace std;

long mod(long a)
{
    long r = a % 1000000007;
    return r < 0 ? r + 1000000007 : r;
}

long countArray(int n, int k, int x) {
    long all = k - 1;
    long with_x = x == 1 ? 0 : 1;
    for (int i = 2; i < n - 1; ++i)
    {
        with_x = mod(all - with_x);
        all = mod(all * (k - 1));
    }
    return mod(all - with_x);
}

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