#include<bits/stdc++.h>
using namespace std;
constexpr int Inf = 1000000010;
constexpr long long INF= 2000000000000000000;

template<typename T> inline bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; }
template<typename T> inline bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; }

template<typename T,typename U>
T modpow(T N, U P, T M = -1) {
    if(P < 0) return 0;
    T ret = 1;
    if(M != -1) ret %= M;
    while(P) {
        if(P & 1) {
            if(M == -1) ret *= N;
            else ret = ret * N % M;
        }
        P /= 2;
        if(M == -1) N *= N;
        else N = N * N % M;
    }
    return ret;
}

constexpr long long MOD = 998244353;

int main() {
    int n;
    cin >> n;
    vector<long long> vec(n);
    for(auto& x: vec) cin >> x;

    //テーブルの整数の並べ方は指定されていない
    sort(vec.begin(),vec.end());
    reverse(vec.begin(),vec.end());

    long long ret = 0;
    for(auto& x: vec) {
        ret += max(abs(vec[0]),abs(x));
    }
    cout << ret << endl;
}