#include <bits/stdc++.h>

using namespace std;

const long MOD = 1000000007;

long countArray(int n, int k, int x) {
    long ones = 1;
    long others = 0;
    for (int i = 1; i < n; ++i) {
        int newOthers = (ones + others * (k - 2) % MOD) % MOD;
        int newOnes = others * (k - 1) % MOD;
        others = newOthers;
        ones = newOnes;
    }
    return x == 1 ? ones : others;
}

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