#include <bits/stdc++.h>

using namespace std;
long p = 1000000007;

long countArray(int n, int k, int x) {
    vector<long> one(n+1);
    vector<long> X(n+1);
    one[3] = k-1;
    X[3] = k-2;
    for(int i = 4; i <= n; i++) {
        one[i] = ((k-1) * X[i-1])%p;
        X[i] = (one[i-1] + ((k-2)*X[i-1])%p)%p;
    }
    if(x == 1) return one[n];
    return X[n];
}

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