#include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>
using namespace std;
typedef long long ll;

int main() {
	ll n, a[200005] = {};

	cin >> n;
	ll m = 0;
	for (ll i = 0; i < n; i++)
	{
		cin >> a[i];

		m = max(m, abs(a[i]));
	}

	cout << n * m << endl;
	return 0;
}