#!/bin/python

import sys

def countArray(n, k, x):
    if(x>=1 and x<=k):
        r=(n-3)*(k-1)+(k-2)
    else:
        r=(n-2)*(k-1)
    return r
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