#!/bin/python3

import sys

def countArray(n, k, x):
    return (pow(k-1,n-3) * (k-3) + pow(k-1,n-4) * (n-1)) % (pow(10,9) + 7)

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)