#include<bits/stdc++.h>
#define poly vector<int>
#define IOS ios::sync_with_stdio(false)
#define ll long long
#define mp make_pair
#define mt make_tuple
#define pa pair < int,int >
#define fi first
#define se second
#define inf 1e18
#define mod 998244353
#define sz(x) ((int)((x).size()))
#define int ll
#define N 1000005
using namespace std;
int n,la,lb;
int a[N],b[N],dp[N],s[N],l[N],r[N];
poly G[N],E[N];
void BellaKira()
{
    cin>>n>>la>>lb;
    for (int i=1;i<=n;i++)
        cin>>a[i];
    for (int i=1;i<=n;i++)
        cin>>b[i];
    sort(a+1,a+n+1);
    sort(b+1,b+n+1);
    for (int i=1;i<=n;i++)
    {
        l[i]=n+1,r[i]=0;
        for (int j=i+1;j<=n;j++)
            if (b[i]>=a[j]&&b[i]<=a[j]+lb)
                l[i]=min(l[i],j),r[i]=max(r[i],j);
    }
    for (int i=1;i<=n;i++) s[i]=s[i-1]+(b[i]>=a[i]&&b[i]<=a[i]+lb);
    dp[0]=0;
    for (int i=1;i<=n;i++)
    {
        bool bl=1;
        dp[i]=max(dp[i],dp[i-1]);
        if (b[i]>=a[i]&&b[i]<=a[i]+lb) dp[i]=max(dp[i],dp[i-1]+1);
        multiset<int>S;
        for (int j=i;j<=n;j++)
        {
            poly().swap(G[j]);poly().swap(E[j]);
        }
        if (l[i]<=r[i])
        {
            G[l[i]].push_back(dp[i-1]-s[i]+1);
            E[r[i]+1].push_back(dp[i-1]-s[i]+1);
        }
        for (int j=i+1;j<=n;j++)
        {
            for (auto u:G[j])
                S.insert(u);
            for (auto u:E[j])
                S.erase(S.find(u));
            if (b[j]<=a[i]+la)
            {
                // cout<<"!"<<i<<" "<<j<<endl;
                if (S.size())   
                    dp[j]=max((*S.rbegin())+s[j-1],dp[j]);
            }
            if (l[j]<=r[j]&&S.size())
            {
                G[l[j]].push_back((*S.rbegin())+s[j-1]-s[j]+1);
                E[r[j]+1].push_back((*S.rbegin())+s[j-1]-s[j]+1);
            }
        }
        // cout<<i<<" "<<a[i]<<","<<a[i]+lb<<" "<<a[i]+la<<endl;
        // cout<<b[i]<<" "<<dp[i]<<endl;
        // cout<<endl;
    }
    cout<<dp[n]<<'\n';
}
signed main()
{
    // freopen("match.out","w",stdout);
    IOS;
    cin.tie(0);
    int T=1;
    while (T--)
    {
        BellaKira();
    }
}