fn main() {
    let mut buf = String::new();
    let mut input = {
        use std::io::Read;
        std::io::stdin().read_to_string(&mut buf).unwrap();
        buf.split_whitespace()
    };

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

    let output = {
        let mut score = 0;
        let mut acceptable = true;
        for p in 3..=35 {
            if a.contains(&p) {
                if acceptable {
                    score += p;
                }
                acceptable = false;
            } else {
                acceptable = true;
            }
        }
        score
    };

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