#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

template <class T>
void chmin(T &a, T b) {
    if (b < a) a = b;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;

    int b[10] = {};
    int s = 0;
    for (int i = 0; i < n; i++) {
        int a;
        cin >> a;
        a %= 10;

        b[a]++;
        s += a;
    }
    s %= 10;

    int dp[10];
    for (int i = 0; i < 10; i++) {
        dp[i] = 1 << 30;
        chmin(b[i], 10);
    }
    dp[0] = 0;

    for (int a = 1; a < 10; a++) {
        for (int k = 1; k <= b[a]; k++) {
            for (int i = 0; i < 10; i++) {
                chmin(dp[i], dp[(i - a * k + 100) % 10] + k);
            }
        }
    }

    cout << n - dp[s] << endl;

    return 0;
}