#include<fstream>
using namespace std;
ifstream fin("teams.in");
ofstream fout("teams.out");
int n,a,b,nr,x,v[100001];
int main()
{
    int i,j;
    fin>>n>>a>>b;
    for (i=1;i<=n;++i)
    {
        fin>>v[i];
        for (j=i-1;j>0 && v[i]<b;--j)
            if (a<=v[i]+v[j] && v[i]+v[j]<=b) ++nr;
    }
    fout<<nr<<'\n';
    return 0;
}