#include <bits/stdc++.h>
using namespace std;
/*#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<typename T> using gpp_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename L> using gpp_map = tree<T, L, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T> using gpp_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;*/
struct fast_ios { fast_ios(){ cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;
#define FOR(i, begin, end) for(int i=(begin);i<(end);i++)
#define REP(i, n) FOR(i,0,n)
#define IFOR(i, begin, end) for(int i=(end)-1;i>=(begin);i--)
#define IREP(i, n) IFOR(i,0,n)
#define Sort(v) sort(v.begin(), v.end())
#define Reverse(v) reverse(v.begin(), v.end())
#define all(v) v.begin(),v.end()
#define SZ(v) ((int)v.size())
#define Lower_bound(v, x) distance(v.begin(), lower_bound(v.begin(), v.end(), x))
#define Upper_bound(v, x) distance(v.begin(), upper_bound(v.begin(), v.end(), x))
#define Max(a, b) a = max(a, b)
#define Min(a, b) a = min(a, b)
#define bit(n) (1LL<<(n))
#define bit_exist(x, n) ((x >> n) & 1)
#define debug(x) cout << #x << "=" << x << endl;
#define vdebug(v) cout << #v << "=" << endl; REP(i_debug, v.size()){ cout << v[i_debug] << ","; } cout << endl;
#define mdebug(m) cout << #m << "=" << endl; REP(i_debug, m.size()){ REP(j_debug, m[i_debug].size()){ cout << m[i_debug][j_debug] << ","; } cout << endl;}
#define pb push_back
#define f first
#define s second
#define int long long
#define INF 1000000000000000000
template<typename T> istream &operator>>(istream &is, vector<T> &v){ for (auto &x : v) is >> x; return is; }
template<typename T> ostream &operator<<(ostream &os, vector<T> &v){ for(int i = 0; i < v.size(); i++) { cout << v[i]; if(i != v.size() - 1) cout << endl; }; return os; }
template<typename T> void Out(T x) { cout << x << endl; }
template<typename T1, typename T2> void Ans(bool f, T1 y, T2 n) { if(f) Out(y); else Out(n); }

using vec = vector<int>;
using mat = vector<vec>;
using Pii = pair<int, int>;
using PiP = pair<int, Pii>;
using PPi = pair<Pii, int>;
using bools = vector<bool>;
using pairs = vector<Pii>;

//int dx[4] = {1,0,-1,0};
//int dy[4] = {0,1,0,-1};
//char d[4] = {'D','R','U','L'};

const int mod = 1000000007;
//const int mod = 998244353;
//#define Add(x, y) x = (x + (y)) % mod
//#define Mult(x, y) x = (x * (y)) % mod

vector<Pii> convex_hull(vector<Pii> &x){
    int n = x.size();
    vector<PPi> x_(n);
    REP(i, n) x_[i] = PPi(x[i], i);
    Sort(x_);
    int k = 0;
    vec qs(2 * n);
    //下側
    REP(i, n){
        while(k > 1){
            int x1 = x[qs[k - 1]].first - x[qs[k - 2]].first;
            int y1 = x[qs[k - 1]].second - x[qs[k - 2]].second;
            int x2 = x_[i].first.first - x[qs[k - 1]].first;
            int y2 = x_[i].first.second - x[qs[k - 1]].second;
            if(x1 * y2 - x2 * y1 <= 0) k--;
            else break;
        }
        qs[k++] = x_[i].second;
    }
    int t = k;
    //上側
    IREP(i, n - 1){
        while(k > t){
            int x1 = x[qs[k - 1]].first - x[qs[k - 2]].first;
            int y1 = x[qs[k - 1]].second - x[qs[k - 2]].second;
            int x2 = x_[i].first.first - x[qs[k - 1]].first;
            int y2 = x_[i].first.second - x[qs[k - 1]].second;
            if(x1 * y2 - x2 * y1 <= 0) k--;
            else break;
        }
        qs[k++] = x_[i].second;
    }
    qs.resize(k - 1);
    vector<Pii> x2(k - 1);
    REP(i, k - 1) x2[i] = x[qs[i]];
    return x2;
}


signed main(){

    int N; cin >> N;
    vec x(N), y(N);
    REP(i, N) cin >> x[i] >> y[i];

    vector<Pii> p;
    p.pb(Pii(0, 0));
    REP(i, N){
        int n = SZ(p);
        REP(j, n) p.pb(Pii(p[j].f + x[i], p[j].s + y[i]));
        p = convex_hull(p);
    }
    int ans = 0;
    for(auto q: p) Max(ans, q.f * q.f + q.s * q.s);
    Out(sqrt(ans));

    return 0;
}


Measured memory_bytes: 256