import java.util.*; @SuppressWarnings("unused") public class Main { private static void solve() { long n = nl(); long a = nl(); long b = nl(); // (1, -1, 1, -1, ...) // -(N-1)A - (N % 2)B // (1, 1, 1, ...) // (N-1)A - NB //(1,1,-1) -B //(1,-1,1) -2A-B //(1,1,1) 2A-3B //-1 k個 // (N-2(2k+1))A -(N-2k)B // k=N/2 // (N-2(N+1)) // (1,-1,1,1) -A - 2B // (1,-1,1,-1) -3A // (1,1,1,1) 3A-4B // (1, 1) A - 2B // (-1, 1) -A // (1, -1) -A // (-1, -1) A + 2B long x = -(n-1) * a - (n % 2) * b; long y = (n-1) * a - n * b; long ret = Math.min(x, y); if (n % 2 == 0) { ret = Math.min(ret, -(n-3) * a - (n % 2 + 2) * b); } System.out.println(ret); } public static void main(String[] args) { new Thread(null, new Runnable() { @Override public void run() { long start = System.currentTimeMillis(); String debug = args.length > 0 ? args[0] : null; if (debug != null) { try { is = java.nio.file.Files.newInputStream(java.nio.file.Paths.get(debug)); } catch (Exception e) { throw new RuntimeException(e); } } reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768); solve(); out.flush(); tr((System.currentTimeMillis() - start) + "ms"); } }, "", 64000000).start(); } private static java.io.InputStream is = System.in; private static java.io.PrintWriter out = new java.io.PrintWriter(System.out); private static java.util.StringTokenizer tokenizer = null; private static java.io.BufferedReader reader; public static String next() { while (tokenizer == null || !tokenizer.hasMoreTokens()) { try { tokenizer = new java.util.StringTokenizer(reader.readLine()); } catch (Exception e) { throw new RuntimeException(e); } } return tokenizer.nextToken(); } private static double nd() { return Double.parseDouble(next()); } private static long nl() { return Long.parseLong(next()); } private static int[] na(int n) { int[] a = new int[n]; for (int i = 0; i < n; i++) a[i] = ni(); return a; } private static char[] ns() { return next().toCharArray(); } private static long[] nal(int n) { long[] a = new long[n]; for (int i = 0; i < n; i++) a[i] = nl(); return a; } private static int[][] ntable(int n, int m) { int[][] table = new int[n][m]; for (int i = 0; i < n; i++) { for (int j = 0; j < m; j++) { table[i][j] = ni(); } } return table; } private static int[][] nlist(int n, int m) { int[][] table = new int[m][n]; for (int i = 0; i < n; i++) { for (int j = 0; j < m; j++) { table[j][i] = ni(); } } return table; } private static int ni() { return Integer.parseInt(next()); } private static void tr(Object... o) { if (is != System.in) System.out.println(java.util.Arrays.deepToString(o)); } }