#![allow(dead_code, unused_mut)]
#![allow(non_snake_case)]

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 main() {
    input!{
        x: i64, y: i64
    }
    let x = x.abs() as u64;
    let y = y.abs() as u64;
    let g = gcd(x, y);
    let mut res = 0.0;
    if g == 0 {
        println!("0");
        return;
    } else if x == y {
        for i in 0..=10 {
            if i * g > 100 { break; }
            res += 1. / ((i * g * 2 + 2) as f64).powi((i * g * 2 + 2) as i32)
        }
    } else {
        for i in 0..=10 {
            for j in 0..=10 {
                if (i + j) * g > 100 { break; }
                res += 1. / ((i * g + j * g + 2) as f64).powi((i * g + j * g + 2) as i32)
            }
        }
    }
    println!("{}", res);
}

fn gcd(mut x: u64, mut y: u64) -> u64 {
    while y > 0 {
        x %= y;
        std::mem::swap(&mut x, &mut y);
    }
    x
}