#!/bin/python

import sys
from itertools import *

def countArray(n, k, x):
    # Return the number of ways to fill in the array.
    tot = (n-1) * (n-3)
    tot *= (n-3)
    return tot
    
    
if __name__ == "__main__":
    n, k, x = raw_input().strip().split(' ')
    n, k, x = [int(n), int(k), int(x)]
    answer = countArray(n, k, x)
    print answer