#include <bits/stdc++.h>
//#include <atcoder/all>

typedef unsigned long long ULLONG;
typedef long long LLONG;
static const LLONG MOD_NUM = 1000000007; //998244353;

template<class _T> static void get(_T& a) {
	std::cin >> a;
}
template<class _T> static void get(_T& a, _T& b) {
	std::cin >> a >> b;
}
template<class _T> static void get(_T& a, _T& b, _T& c) {
	std::cin >> a >> b >> c;
}
template <class _T> static _T tp_abs(_T a) {
	if (a < (_T)0) {
		a *= (_T)-1;
	}
	return a;
}

static void A();

int main()
{
	A();
	fflush(stdout);
	return 0;
}

static int dfs(std::map<int, int>& lsbs, int mod)
{
	int ans = MOD_NUM;

	if (lsbs.find(mod) != lsbs.end()) {
		return 1;
	}
	for (int i = 1; i < mod; i++) {
		int val1, val2;
		if (lsbs.find(i) != lsbs.end() && lsbs[i] > 0) {
			val1 = 1;
			lsbs[i]--;
			val2 = dfs(lsbs, mod - i);
			lsbs[i]++;
		}
		else {
			val1 = dfs(lsbs, i);
			val2 = dfs(lsbs, mod - i);
		}

		ans = std::min(ans, val1 + val2);
	}
	return ans;
}

static void A()
{
	int N;
	get(N);
	
	std::map<int, int> lsbs;

	int ai, ttl = 0;
	for (int i = 0; i < N; i++) {
		get(ai);
		ttl += ai % 10;
		lsbs[ai % 10]++;
	}

	int ans = N - 1;
	int mod = ttl % 10;
	if (lsbs.find(mod) == lsbs.end()) {
		ans = N - dfs(lsbs, mod);
	}

	printf("%d\n", ans);
}