#!/bin/python3

import sys

def countArray(n, k, x):
    s=1
    for i in range(0, n-3):
        s = (s*(k-1))%1000000007
    return int((s*(k-1) + (k-2)*s*(k-2))/(k-1))%1000000007
    # Return the number of ways to fill in the array.

if __name__ == "__main__":
    n, k, x = input().strip().split(' ')
    n, k, x = [int(n), int(k), int(x)]
    answer = countArray(n, k, x)
    print(answer)