#include<cstdio>
#include<vector>

using namespace std;

const unsigned int m = 699967;
const int lim = (1<<4);
const unsigned int N = (1<<20);

unsigned int ha[m][lim],hb[m][lim];

unsigned int n,v[N];
int a,b;

void citire()
{
	char s[11],*p;
	scanf("%u%u%u\n",&n,&a,&b);
	for(unsigned int i=0;i<n;++i)
	{
		scanf("%s\n",s);
		for(p=s;*p;++p)
			v[i]=v[i]*10+*p-'0';
	}
}

bool exista(unsigned int h[m][lim],unsigned int x)
{
	unsigned int i,r=x%m;
	for(i=1;i<=h[r][0];++i)
		if(h[r][i]==x)
			return true;
	return false;
}

void sterge(unsigned int h[m][lim],unsigned int x)
{
	unsigned int r=x%m,i;
	for(i=1;i<=h[r][0];++i)
		if(h[r][i]==x)
		{
			h[r][i]=0;
			return;
		}
}

inline void adauga(unsigned int h[m][lim],unsigned int x)
{
	unsigned int r=x%m;
	h[r][++h[r][0]]=x;
}

void calcul()
{
	long long rez=0;
	unsigned int i;
	int nra=0,nrb=0,pa=-1,pb=-1;
	for(i=0;i<n;++i)
	{
		if(!exista(ha,v[i]))
			++nra;
		adauga(ha,v[i]);
		while(nra==a)
		{
			sterge(ha,v[++pa]);
			if(!exista(ha,v[pa]))
				--nra;
		}
		if(!exista(hb,v[i]))
			++nrb;
		adauga(hb,v[i]);
		while(nrb>b)
		{
			sterge(hb,v[++pb]);
			if(!exista(hb,v[pb]))
				--nrb;
		}
		rez+=pa-pb;
	}
	printf("%lld\n",rez);
}

int main()
{
	freopen("secv5.in","r",stdin);
	freopen("secv5.out","w",stdout);
	citire();
	calcul();
	return 0;
}