use std::io::*;
use std::str::FromStr;

fn main() {
    let n: usize = read();
    let r: f64 = read();
    let mut tmp = 100.0;
    let mut ans = 0.0;
    for _i in 0..n{
        ans += tmp;
        tmp *= 1.0 - r;
    }
    print!("{}",ans);
}
pub fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}