macro_rules! input {
  ($x:ident, $v:expr, $idx:expr) => {
    let $x = $v[$idx].clone();
  };

  ($x:ident, $v:expr, $idx:expr, $type:ty) => {
    let $x:$type = $v[$idx].clone().parse().unwrap();
  };

  ( $v:expr; $($x:ident),* ) => {
    let mut idx:i64 = -1;
    $(
      idx += 1;
      input!($x, $v, idx as usize);
    )*
  };

  ( $v:expr; $($x:ident:$t:ty),* ) => {
    let mut idx:i64 = -1;
    $(
      idx += 1;
      input!($x, $v, idx as usize, $t);
    )*
  };

  ( $($x:ident:$t:ty),* ) => {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let input:Vec<String> = s.trim()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect();
    let mut idx:i64 = -1;
    $(
      idx += 1;
      input!($x, input, idx as usize, $t);
    )*
  };
}

fn main() {
  input!(a:f64, b:f64);

  const D: i64 = 10000;
  let dx = (b - a) / D as f64;

  let f = |x| { (x-a) * (x-b) * dx };

  let mut result = 0.0;
  let mut x = a;
  for _i in 0..D {
    result += f(x).abs();
    x += dx;
  }
  println!("{}", result);
}