#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
#define debug(x) std::cout << #x << ": " << x << '\n';
int solve(vector <int> l, vector <int> r) {

    auto half = [] (vector <int> a) {
        int sz = a.size();
        int ans = 0;
        for (int i = 0; i < sz/2; ++i) {
            ans += a[i];
            ans -= a[sz - 1 - i];
        }        
        return ans;                        
    };  

    auto mid = [] (vector <int> a) {
        int sz = a.size();
        assert(sz&1);
        return a[sz/2];
    };  

    if (l.size() % 2 == 0 && r.size() % 2 == 0) {
        return half(l) + half(r);
    }   
    else if (l.size() % 2 && r.size() % 2 == 0) {
        return half(l) + half(r) + mid(l);
    }   
    else if (l.size() % 2 == 0 && r.size() % 2) {
        return half(l) + half(r) + mid(r);
    }   
    else {
        assert(0);
    }   
}   
signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    #define endl '\n'
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif
    int n;
    cin >> n;
    int s, t;
    cin >> s >> t;
    s--; t--;
    vector <int> a(n);
    for (int i = 0; i < n; ++i)
        cin >> a[i];
    
    vector <int> l, r;
    for (int i = min(s, t) + 1; i != max(s, t); i++) {
        l.app(a[i]);
    }   
    if (s > t)
        reverse(all(l));
    for (int i = (max(s, t) + 1) % n; i != min(s, t); i = (i + 1) % n) {
        r.app(a[i]);
    }   
    if (s < t)
        reverse(all(r));

    auto shift = [] (vector <int> a) {
        vector <int> ans;
        for (int i = 1; i < a.size(); ++i)
            ans.app(a[i]);
        return ans;
    };  
    auto rev = [] (vector <int> a) {
        reverse(all(a));
        return a;
    };
    if (l.size() % 2 && r.size() % 2) {
        cout << max(l[0] - solve(rev(shift(l)), rev(r)), r[0] - solve(rev(l), rev(shift(r)))) + a[s] - a[t] << endl;
    }    
    else {
        cout << solve(l, r) + a[s] - a[t] << endl;
    }   
}