#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv) {
  int n, h, v;
  scanf("%d %d %d", &n, &h, &v);

  int max_h = h > n - h ? h : n - h;
  int max_v = v > n - v ? v : n - v;

  printf("%d\n", max_h * max_v * 4);
  return 0;
}