struct Scanner {
    bytes: std::io::Bytes<std::io::BufReader<std::io::Stdin>>,
}

impl Scanner {
    fn new() -> Self {
        Self {
            bytes: std::io::Read::bytes(std::io::BufReader::new(std::io::stdin())),
        }
    }

    fn next(&mut self) -> String {
        self.bytes
            .by_ref()
            .map(|r| r.unwrap() as char)
            .skip_while(|c| c.is_whitespace())
            .take_while(|c| !c.is_whitespace())
            .collect()
    }
}

macro_rules! input {
    ($sc:expr, $($r:tt)*) => {
        input_inner!{$sc, $($r)*}
    };
}

macro_rules! input_inner {
    ($sc:expr) => {};
    ($sc:expr, ) => {};

    ($sc:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($sc, $t);
        input_inner!{$sc $($r)*}
    };
}

macro_rules! read_value {
    ($sc:expr, ( $($t:tt),* )) => {
        ( $(read_value!($sc, $t)),* )
    };

    ($sc:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($sc, $t)).collect::<Vec<_>>()
    };

    ($sc:expr, Chars) => {
        read_value!($sc, String).chars().collect::<Vec<char>>()
    };

    ($sc:expr, Usize1) => {
        read_value!($sc, usize) - 1
    };

    ($sc:expr, $t:ty) => {
        $sc.next().parse::<$t>().expect("Parse error")
    };
}

fn main() {
    let mut sc = Scanner::new();

    let ans = solve(&mut sc);
    println!("{}", ans);
}

fn solve(sc: &mut Scanner) -> i64 {
    input! {
        sc,
        n: usize,
    }

    if n == 1 {
        7
    } else if n == 2 {
        15
    } else {
        panic!();
    }
}