macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let mut s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };

    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };

    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };

    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}


fn hoge(n: i64, a: i64, b: i64, k: i64) -> i64 {
    if k >= n {
        0
    } else {
        a * (n - 2 * k - 1) - b * (n - k - (k % 2))
    }
}


fn main() {
    input! {
        n: i64,
        a: i64,
        b: i64,
    };

    //let x1 = -a * (n - 1) - b * (n % 2);
    //let x2 = a * (n - 1) - n * b;
    let x = [hoge(n, a, b, 0), hoge(n, a, b, 1), hoge(n, a, b, n - 1), hoge(n, a, b, n - 2)];
    println!("{}", x.iter().min().unwrap());
}