#include "books.h"
#include "bits/stdc++.h"
using namespace std;
#define fi first
#define se second
#define ll long long
#define dbg(v) cerr<<#v<<" = "<<v<<'\n'
#define vi vector<int>
#define vl vector <ll>
#define pii pair<int,int>
#define mp make_pair
#define db long double
#define pb push_back
#define all(s) s.begin(),s.end()
template < class T > T smin(T &a,T b) {if (a > b) a = b;return a;}
template < class T > T smax(T &a,T b) {if (a < b) a = b;return a;}
#include "books.h"
long long minimum_walk(std::vector<int> p, int s) {
int n = p.size();
ll ans = 0;
for (int i = 0;i < n;++i)
ans += abs(i - p[i]);
int mx = 0;
for (int i = 0;i < n;++i)
smax(mx,p[i]),ans += i == mx;
return ans;
}
