#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let n = read::<usize>();
    let a = read_vec::<i64>()
        .iter()
        .map(|&x| (x % 10) as usize)
        .collect::<Vec<_>>();
    let mut count = vec![0; 10];
    for i in 0..n {
        count[a[i]] += 1;
    }

    let mut dp = vec![std::usize::MAX; 10];
    dp[0] = 0;
    for i in 0..n {
        for prev in 0..10 {
            if dp[prev] != std::usize::MAX {
                dp[(prev + a[i]) % 10] = min(dp[(prev + a[i]) % 10], dp[prev] + 1);
            }
        }
    }
    let res = a.iter().sum::<usize>() % 10;
    println!("{}", n - dp[res]);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}