#include <bits/stdc++.h>
using namespace std;
#define int long long
const int inf = 2e18;
signed main(){
ios::sync_with_stdio(0);
cin.tie(0);
int n;
cin >> n;
int sl,sc;
cin >> sl >> sc;
sl--;
sc--;
int el,ec;
cin >> el >> ec;
el--;
ec--;
int arr[n];
for(int &i : arr){
cin >> i;
++i;
}
set<array<int,2>>pts[n];
priority_queue<array<int,3>,vector<array<int,3>>,greater<array<int,3>>>pq;
pq.push({0,sl,sc});
int dist[n][5005];
for(int i = 0;i<n;i++){
fill(dist[i],dist[i]+5005,inf);
}
dist[sl][sc]=0;
while(!pq.empty()){
array<int,3>a = pq.top();
pq.pop();
if(a[1]<0||a[1]>=n){
continue;
}
if(a[2]>=arr[a[1]]){
a[2]=arr[a[1]]-1;
}
if(dist[a[1]][a[2]]<a[0]){
//better found
continue;
}
//check
if(a[1]<n-1){
int x = a[1]+1;
int y = a[2];
y=min(y,arr[a[1]]-1);
if(dist[x][y]>a[0]+1){
dist[x][y]=a[0]+1;
pq.push({dist[x][y],x,y});
}
}
if(a[1]){
int x = a[1]-1;
int y = a[2];
y=min(y,arr[a[1]]-1);
if(dist[x][y]>a[0]+1){
dist[x][y]=a[0]+1;
pq.push({dist[x][y],x,y});
}
}
if(a[2]==0){
if(a[1]){
int x = a[1]-1;
int y = arr[a[1]-1]-1;
if(dist[x][y]>a[0]+1){
dist[x][y]=a[0]+1;
pq.push({dist[x][y],x,y});
}
}
}
if(a[2]==arr[a[1]]-1){
if(a[1]<n-1){
int x = a[1]+1;
int y = 0;
if(dist[x][y]>a[0]+1){
dist[x][y]=a[0]+1;
pq.push({dist[x][y],x,y});
}
}
}
if(a[2]!=0&&dist[a[1]][a[2]-1]>a[0]+1){
dist[a[1]][a[2]-1]=a[0]+1;
pq.push({dist[a[1]][a[2]-1],a[1],a[2]-1});
}
if(a[2]!=arr[a[1]]-1&&dist[a[1]][a[2]+1]>a[0]+1){
dist[a[1]][a[2]+1]=a[0]+1;
pq.push({dist[a[1]][a[2]+1],a[1],a[2]+1});
}
}
cout << dist[el][ec];
return 0;
}
