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#include <fstream>
#include <unordered_map>
using namespace std;
ifstream cin("secv5.in");
ofstream cout("secv5.out");
long long int v[2000005];
long long l,a,b,n;
long long cnt(int x){
    long long i=0,j=0,ans=0,nr=0;
    unordered_map <long long,int> frecv;
    while(j<n){
        frecv[v[j]]++;
        if(frecv[v[j]]==1)nr++;
        j++;
        while(nr>x){
            frecv[v[i]]--;
            if(frecv[v[i]]==0)nr--;
            i++;
        }
        ans+=j-i;
    }
    return ans;
}
int main()
{
    cin>>n>>a>>b;
    for (int i = 0; i < n; i++) {
        cin>>v[i];
    }
    cout<<cnt(b)-cnt(a-1);
    return 0;
}