fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut result: i128 = 0i128;
    for _ in 0..n {
        let mut a = String::new();
        std::io::stdin().read_line(&mut a).ok();
        let a: Vec<&str> = a.trim().split('.').collect();
        if a.len() == 1 {
            result += a[0].parse::<i128>().unwrap() * 1e10 as i128;
        } else {
            result += a[0].parse::<i128>().unwrap() * 1e10 as i128;
            let times: usize = 10 - a[1].len();
            result += a[1].parse::<i128>().unwrap() * 10i128.pow(times as u32) * if a[0].starts_with('-') { -1 } else { 1 };
        }
        println!("{}", result);
    }
    println!("{}.{:010}", result / (1e10 as i128), result % (1e10 as i128));
}