#include<bits/stdc++.h>
using namespace std;
 
main(){
    int n,k1,k2;
    long long ans=0;
    cin>>n>>k1>>k2;
    vector<int>v(n);
    for(auto &it:v)cin>>it;
 
    for(int i=0,j=1;j<n-2;j++){
        int c1=0,c2=0;
 
        while(v[i]+v[j]<=k1)i++;
 
        c1=j-i;
 
        int k=j+1,l=n-1;
 
        while(k<l){
            if(v[k]+v[l]>k2){
                c2+=l-k;
                l--;
            }
            else k++;
        }
 
        ans+=c1*c2;
    }
    cout<<ans<<"\n";
}

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