#include <fstream>
#include <iostream>
#include <map>
#include <hash_map>
#include <iterator>
#include <algorithm>
#include <vector>
#include <cstring>
   
#define MAXN ((1<<20) + 1)
#define HASH_SIZE 38993
   
using namespace std;
//using namespace __gnu_cxx;
   
unsigned int vec[MAXN];
int minimumSpans[MAXN];
  
typedef unsigned int uint32;
  
class HashTable
{
public:
    uint32& operator [] (uint32 key)
    {
        uint32 hash = key % HASH_SIZE;
           
        vector<pair<uint32,uint32> >::iterator it = find_if(table[hash].begin(), table[hash].end(), FindKey(key));
        if (it != table[hash].end())
        {
            return it->second;
        }
           
        table[hash].push_back(make_pair(key, 0));
           
        return table[hash][table[hash].size() - 1].second;
    }
       
    bool find(uint32 key, uint32& val) const
    {
        uint32 hash = key % HASH_SIZE;
           
        vector<pair<uint32,uint32> >::const_iterator it = find_if(table[hash].begin(), table[hash].end(), FindKey(key));
        if (it != table[hash].end())
        {
            val = it->second;
            return true;
        }
           
        return false;
    }
       
    void erase(uint32 key, vector<pair<uint32,uint32> >::iterator& it)
    {
        uint32 hash = key % HASH_SIZE;
           
        table[hash].erase(it);
    }
     
    void clear()
    {
        for (int i=0; i<HASH_SIZE; ++i)
        {
            table[i].clear();
        }
    }
       
private:
    struct FindKey
    {
        FindKey(uint32 key) :
            keyToFind(key)
        {}
   
        bool operator () (const pair<uint32,uint32>& kvp) const
        {
            return kvp.first == keyToFind;
        }
           
        uint32 keyToFind;
    };
   
    vector<pair<uint32,uint32> > table[HASH_SIZE];
};
  
HashTable mapDistincts;
   
int main()
{
    int n, L, U;
    long long numSecv = 0;
    fstream fin ("secv5.in" , fstream::in);
    fstream fout("secv5.out", fstream::out);
    
    fin.seekg(0, ios::end);
    int end = fin.tellg();
    
    char* buffer = static_cast<char*>(malloc(end));

    fin.seekg (0, ios::beg);
    fin >> n >> L >> U;
    //cout << n << " " << L << " " << U << endl;
    
    fin.read(buffer, end);
    //cout << buffer << endl;

    char* pCurrent = buffer + 1;
    char* pNext;
    for (int i=1; i<=n; ++i)
    {
        vec[i] = strtoul(pCurrent, &pNext, 10);
        pCurrent = pNext;
        //fin >> vec[i];
        //cout << vec[i] << " ";
    }
    //cout << endl;
    
    //free(buffer);
   
    //hash_map<int, int> mapDistincts;
    unsigned int distincts = 0;
    int span = 1;
       
    for (int i=1; i<=n; ++i)
    {
        mapDistincts[vec[i]]++;
        if (mapDistincts[vec[i]] == 1)
        {
            distincts++;
        }
           
        while (distincts > L-1)
        {
            mapDistincts[vec[span]]--;
            if (mapDistincts[vec[span]] == 0)
            {
                distincts--;
            }
               
            span++;
        }
           
        minimumSpans[i] = span;
    }
     
    //mapDistincts.clear();
    //ostream_iterator<int> itOut(cout, " ");
    //copy(minimumSpans, minimumSpans + n + 1, itOut);
    //cout << endl;
  
    distincts = 0;
    span = 1;
       
    for (int i=1; i<=n; ++i)
    {
        mapDistincts[vec[i]]++;
        if (mapDistincts[vec[i]] == 1)
        {
            distincts++;
        }
           
        while (distincts > U)
        {
            mapDistincts[vec[span]]--;
            if (mapDistincts[vec[span]] == 0)
            {
                distincts--;
            }
               
            span++;
        }
           
        //maximumSpans[i] = span;
           
        numSecv += (minimumSpans[i] - span);
    }
   
    //copy(maximumSpans, maximumSpans + n + 1, itOut);
    //cout << endl;
       
    fout << numSecv << "\n";
       
    return 0;
}