#include <bits/stdc++.h>

using namespace std;

class InParser
{
private:
    FILE *fin;
    char *buff;
    int sp;
    char read_ch()
    {
        ++sp;
        if(sp==4096)
        {
            sp=0;
            fread(buff,1,4096,fin);
        }
        return buff[sp];
    }

public:
    InParser(const char* nume)
    {
        fin=fopen(nume,"r");
        buff=new char[4096]();
        sp=4095;
    }
    InParser& operator >> (int &n)
    {
        char c;
        while(!isdigit(c=read_ch())&&c!='-');
        int sgn=1;
        if (c=='-')
        {
            n=0;
            sgn=-1;
        }
        else
        {
            n=c-'0';
        }
        while(isdigit(c=read_ch()))
        {
            n=10*n+c-'0';
        }
        n*=sgn;
        return *this;
    }

    InParser& operator >> (long long &n)
    {
        char c;
        n=0;
        while(!isdigit(c=read_ch())&&c!='-');
        long long sgn=1;
        if(c=='-')
        {
            n=0;
            sgn=-1;
        }
        else
        {
            n=c-'0';
        }
        while(isdigit(c=read_ch()))
        {
            n=10*n+c-'0';
        }
        n*=sgn;
        return *this;
    }
};
class OutParser {
private:
    FILE *fout;
    char *buff;
    int sp;

    void write_ch(char ch) {
        if (sp == 50000) {
            fwrite(buff, 1, 50000, fout);
            sp = 0;
            buff[sp++] = ch;
        } else {
            buff[sp++] = ch;
        }
    }


public:
    OutParser(const char* name) {
        fout = fopen(name, "w");
        buff = new char[50000]();
        sp = 0;
    }
    ~OutParser() {
        fwrite(buff, 1, sp, fout);
        fclose(fout);
    }

    OutParser& operator << (int vu32) {
        if (vu32 <= 9) {
            write_ch(vu32 + '0');
        } else {
            (*this) << (vu32 / 10);
            write_ch(vu32 % 10 + '0');
        }
        return *this;
    }

    OutParser& operator << (long long vu64) {
        if (vu64 <= 9) {
            write_ch(vu64 + '0');
        } else {
            (*this) << (vu64 / 10);
            write_ch(vu64 % 10 + '0');
        }
        return *this;
    }

    OutParser& operator << (char ch) {
        write_ch(ch);
        return *this;
    }
    OutParser& operator << (const char *ch) {
        while (*ch) {
            write_ch(*ch);
            ++ch;
        }
        return *this;
    }
};

InParser fin("secv5.in");
OutParser fout("secv5.out");

const int Nmax = 2e6;

unordered_map < long long , int > M;

long long a[Nmax];


int n, L, U;


int main()
{
    int i, j, nrd;
    long long s, s1;
    fin >> n >> L >> U;
    for(i = 1 ; i <= n ; i++)
        fin >> a[i];
    j = 1;
    nrd = 0;
    s = s1 = 0;
    for(i = 1 ; i <= n ; i++)
    {
        ++M[a[i]];
        if(M[a[i]] == 1)
            ++nrd;
        while(nrd > U && j <= i)
        {
            --M[a[j]];
            if(M[a[j]] == 0)
                --nrd;
            ++j;

        }
        s += (i - j + 1);
    }
    M . clear();
    U = L - 1;
    j = 1;
    nrd = 0;
    for(i = 1 ; i <= n ; i++)
    {
        ++M[a[i]];
        if(M[a[i]] == 1)
            ++nrd;
        while(nrd > U)
        {
            --M[a[j]];
            if(M[a[j]] == 0)
                --nrd;
            ++j;

        }
        s1 += (i - j + 1);
    }
    fout << (s - s1) << "\n";
    return 0;
}