#include<bits/stdc++.h>
using namespace std;
#define int long long
#define oo 10000000000000001
int s,t,n,a,b,dl[200005],dr[200005],ans=oo;
signed main(){
ios::sync_with_stdio(0),cin.tie(0);
cin>>n>>a;
for(int i=1;i<=n-1;i++){
cin>>b;
dl[i]=max(a-a,1-b+a);
s+=dl[i];
//cout<<dl[i]<<'\n';
dr[i]=max(a-a,b-a+1);
//cout<<dr[i]<<'\n';
a=b;
}
for(int i=n-1;i>=1;i--){
ans=min(ans,max(s,t));
s-=dl[i];
t+=dr[i];
}
cout<<ans<<'\n';
return 0;
}
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