#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define endl '\n'
#define Valerian void
#define Valerian_or_Habil ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
using namespace std;
Valerian solve() {
int n;
cin >> n;
int sl, sc, el, ec;
cin >> sl >> sc >> el >> ec;
vector<int> l(n + 1);
int max_c = 0;
for (int i = 1; i <= n; i++) {
cin >> l[i];
max_c = max(max_c, l[i] + 1);
}
if (sl == el && sc == ec) {
cout << 0 << endl;
return;
}
vector<vector<int>> dist(n + 1, vector<int>(max_c + 1, -1));
queue<pair<int, int>> q;
q.push({sl, sc});
dist[sl][sc] = 0;
while (!q.empty()) {
pair<int, int> curr = q.front();
int r = curr.first;
int c = curr.second;
int d = dist[r][c];
q.pop();
if (r == el && c == ec) {
cout << d << endl;
return;
}
vector<pair<int, int>> moves;
if (c > 1) moves.pb({r, c - 1});
else if (r > 1) moves.pb({r - 1, l[r - 1] + 1});
if (c < l[r] + 1) moves.pb({r, c + 1});
else if (r < n) moves.pb({r + 1, 1});
if (r > 1) moves.pb({r - 1, min(c, l[r - 1] + 1)});
if (r < n) moves.pb({r + 1, min(c, l[r + 1] + 1)});
for (auto &m : moves) {
int nr = m.first;
int nc = m.second;
if (dist[nr][nc] == -1) {
dist[nr][nc] = d + 1;
q.push({nr, nc});
}
}
}
}
int main() {
Valerian_or_Habil;
solve();
return 0;
}
