#include <bits/stdc++.h>

using namespace std;

long countArray(int n, int k, int x) {
    long long int ans = x == 1 ? 1LL : 0LL;
    const long mod = 1000 * 1000 * 1000 + 7;
    long long int sm = 1LL;
    for(int i = 1; i < n; ++i) {
        ans = (sm - ans + mod) % mod;
        sm = sm * (k - 1) % mod;
    }
    return static_cast<long>(ans);
}

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