#include <bits/stdc++.h>
using namespace std;

long countArray(long long int n, long long int k, long long int x) {
    // Return the number of ways to fill in the array.
    
    long long int ans = ((n-3)*(k-1)%1000000007 + (k-2)%1000000007)%1000000007;
    return ans;
}

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