#include <cstdio>
#include <stdio.h>
#include <stdbool.h>
#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
#include <numeric>
#include <cassert>
using namespace std;
#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second
int32_t main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, ans=LLONG_MAX;
cin>>n;
vector<int> psum(n+1, 0), ssum(n+2, 0), vect(n+1, 0);
for (int i=1; i<=n; ++i)cin>>vect[i], psum[i]=psum[i-1]+max(0ll, vect[i-1]-vect[i]+1);
for (int i=n; i>=1; --i)ssum[i]=ssum[i+1]+max(0ll, vect[i+1]-vect[i]+1);
for (int i=1; i<=n; ++i)ans=min(ans, max(psum[i], ssum[i]));
cout<<ans;
}
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