#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N = 1e5+5;
ll par[N];
int besthub(int rr, int L, int x[], ll b){
par[0] = 0;
for(int i = 1; i <= rr; ++i)
par[i] = par[i-1]+x[i-1];
auto eday = [&](int s, int t) -> ll {
int p = (s+t)>>1;
ll wow = (p-s)*x[p]-(par[p]-par[s])+(par[t+1]-par[p+1])-(t-p)*x[p];
return wow;
};
auto calc = [&](int k) -> bool {
deque<int> dq;
for(int i = 0; i <= k; ++i)
dq.pb(i);
int s = dq.front(), t = dq.back();
bool done = 0;
done |= eday(s, t) <= b;
for(int i = k+1; i < rr and !done; ++i)
dq.pop_front(), dq.pb(i), s = dq.front(), t = dq.back(), done |= eday(s, t) <= b;
return done;
};
int l = 0, r = rr-1, answer = -1;
while(l <= r){
int mid = (l+r)>>1;
if(calc(mid))
l = mid+1, answer = mid+1;
else
r = mid-1;
}
return answer;
}
