/* -*- coding: utf-8 -*-
 *
 * 2057.cc:  No.2057 Ising Model - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

const long long LINF = 1LL << 62;

/* typedef */

typedef long long ll;

/* global variables */

/* subroutines */

/* main */

int main() {
  ll n;
  int a, b;
  scanf("%lld%d%d", &n, &a, &b);

  ll f0 = a * (n - 1) - b * n;
  ll f1 = -a * (n - 1) + b * n;
  ll f2 = -a * (n - 1) - b * (n & 1);

  printf("%lld\n", min(min(f0, f1), f2));

  if (false) {
    int nbits = 1 << n, ss[20], minss[20];
    ll minf = LINF;
    for (int bits = 0; bits < nbits; bits++) {
      for (int i = 0, bi = 1; i < n; i++, bi <<= 1)
	ss[i] = (bits & bi) ? -1 : 1;
      ll f = 0;
      for (int i = 0; i + 1 < n; i++) f += a * ss[i] * ss[i + 1];
      for (int i = 0; i < n; i++) f -= b * ss[i];
      if (minf > f) minf = f, copy(ss, ss + n, minss);
    }
    printf("%lld:", minf);
    for (int i = 0; i < n; i++) printf(" %d", ss[i]);
    putchar('\n');
  }
  return 0;
}