#include <iostream>
#include <cstdio>
using namespace std;
#include <vector>
#include <unordered_map>
 int V[200000000],n;
 int rez(int limita)
{
     int r=0;
     int s,d;
    unordered_map <unsigned int,int> H;
    for (s=1,d=1;d<=n;++d)
    {
        ++H[V[d]];
        while (H.size()>limita)
        {
            //H[V[s]]--;
            if (--H[V[s]]==0) H.erase(V[s]);
            s++;
        }
        r+=d-s+1;
    }
    return r;
}
int main()
{
   freopen("secv5.in","r",stdin);
   freopen("secv5.out","w",stdout);
   int s,d,i;
  // scanf("%lli %lli %lli",&n,&s,&d);
   cin>>n>>s>>d;
   for (i=1;i<=n;i++)
   {
      // scanf("%lli",V[i]);
      cin>>V[i];
   }
   cout<<rez(d)-rez(s-1);
}