use std::collections::*;

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>().split_whitespace()
        .map(|e| e.parse().ok().unwrap()).collect()
}

fn main() {
    let n: usize = read();
    let v: Vec<u32> = read_vec();
    let (c, v) = (v[0], v[1]);
    let mut dp: Vec<Vec<u32>> = vec![vec![std::u32::MAX; n + 1]; n + 1];
    dp[1][1] = c;
    for i in 1..n + 1 {
        for j in 1..n + 1 {
            if dp[i][j] == std::u32::MAX {
                continue;
            }
            let index = std::cmp::min(i + j, n);
            if dp[index][j] > dp[i][j] + v {
                dp[index][j] = dp[i][j] + v;
                dp[index][index] = std::cmp::min(dp[index][j] + c, dp[index][index]);
            }
        }
    }

    let mut ans = std::u32::MAX;
    // println!("{:?}", dp[n]);
    for j in 1..n + 1 {
        ans = std::cmp::min(ans, dp[n][j]);
    }
    println!("{:?}", ans);
}