This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
#define pb push_back
#define double long double
const int N=2e5+5;
int a[N];
int dp[N];
int b[N];
int n;
int st[4*N];
void update(int node, int L, int R, int idx, int val){
if(L==R){
st[node]=val;
return ;
}
int mid=(L+R)/2;
if(L<=idx and idx<=mid){
update(node*2,L,mid,idx,val);
}
else {
update(node*2+1,mid+1,R,idx,val);
}
st[node]=max(st[node*2],st[node*2+1]);
}
int find(int node, int L , int R, int l, int r){
if(l>R or L>r)return 0;
if(l<=L and R<=r)return st[node];
int mid=(L+R)/2;
return max( find(node*2,L,mid,l,r) , find(node*2+1,mid+1,R,l,r)) ;
}
void sbtsk4(){
map<int,int>mp;
for(int i=1;i<=n;i++){
cin>>a[i];
mp[a[i]];
}
int ans=0;
int idx=1;
for(auto it=mp.begin();it!=mp.end();it++){
it->ss = idx++;
}
for(int i=1;i<=n;i++)a[i]=mp[a[i]];
for(int i=1;i<=n;i++){
dp[i]= find(1,1,n,1,a[i]-1)+1;
dp[i]=max(dp[i],1LL);
ans=max(dp[i],ans);
update(1,1,n,a[i],dp[i]);
}
cout<<ans;
}
int fun(int l, int r, int x){
for(int i=0;i<=2000;i++)st[i]=0;
for(int i=0;i<=1000;i++){
dp[i]=0;
}
for(int i=1;i<=n;i++){
if(l<=i and i<=r)b[i]=a[i]-x;
else b[i]=a[i];
}
map<int,int>mp;
for(int i=1;i<=n;i++){
mp[b[i]];
}
int ans=0;
int idx=1;
for(auto it=mp.begin();it!=mp.end();it++){
it->ss = idx++;
}
for(int i=1;i<=n;i++)b[i]=mp[b[i]];
for(int i=1;i<=n;i++){
dp[i]= find(1,1,n,1,b[i]-1)+1;
dp[i]=max(dp[i],1LL);
ans=max(dp[i],ans);
update(1,1,n,b[i],dp[i]);
}
return st[1];
}
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int x;
cin>>n>>x;
if(x==0 or x==1e9){
sbtsk4();
return 0;
}
for(int i=1;i<=n;i++){
cin>>a[i];
}
int ans=0;
int l=1;
for(int r=l+1;r<=n;r++){
ans=max(ans,fun(l,r,x));
ans=max(ans,fun(l,r,-x));
}
cout<<ans;
}
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