#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];
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);
    dp[0]=0;
    for (int i=1;i<=n;i++)
    {
        bool bl=1;
        for (int j=i;j<=n;j++)
        {
            if (bl&&b[j]<=a[i]+la)
                dp[j]=max(dp[i-1]+j-i,dp[j]);
            bl&=(b[j]>=a[i+1]&&b[j]<=a[i+1]+lb);
        }
    }
    cout<<dp[n]<<'\n';
}
signed main()
{
    IOS;
    cin.tie(0);
    int T=1;
    while (T--)
    {
        BellaKira();
    }
}