import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static int[] dp;
    static int copy;
    static int paste;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        copy = sc.nextInt();
        paste = sc.nextInt();
        dp = new int[n * 2];
        Arrays.fill(dp, -1);
        dp[0] = 0;
        dp[1] = 0;
        int ans = Integer.MAX_VALUE;
        for (int i = n; i < n * 2; i++) {
            ans = Math.min(ans, dfw(i));
        }
        System.out.println(ans);
    }
    
    static int dfw(int x) {
        if (dp[x] < 0) {
            dp[x] = copy + paste * (x - 1);
            for (int i = 2; i <= Math.sqrt(x); i++) {
                if (x % i == 0) {
                    dp[x] = Math.min(dp[x], dfw(x / i) + copy + paste * (i - 1));
                    dp[x] = Math.min(dp[x], dfw(i) + copy + paste * (x / i - 1));
                }
            }
        }
        return dp[x];
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}