fn main() {
    let stdin = std::io::read_to_string(std::io::stdin()).unwrap();
    let mut stdin = stdin.split_ascii_whitespace();

    let n: usize = stdin.next().unwrap().parse().unwrap();
    let c: Vec<u32> = (0..n)
        .map(|_| stdin.next().unwrap().parse().unwrap())
        .collect();

    println!("{}", output(solve(c)));
}

fn solve(c: Vec<u32>) -> u32 {
    let total = c.iter().sum::<u32>();
    c.into_iter().filter(|&c| c * 10 <= total).count() as u32 * 30
}

fn output(ans: u32) -> u32 {
    ans
}