#include<bits/stdc++.h>
#define int long long
using namespace std;
int n,m,ans=0,dem=0;
map<int,int>p;
signed main()
{
    cin>>n>>m;
    int a[n+1];
    for (int i=1;i<=n;i++)
    {
        cin>>a[i];
    }
    for (int l=1,r=1;r<=n;r++)
    {
        if (p[a[r]]==0)
        {
            dem++;
            p[a[r]]=1;
        }
        else p[a[r]]++;
        while (dem>m)
        {
            p[a[l]]--;
            if (p[a[l]]==0)
            {
                dem--;
            }
            l++;
        }
        ans+=r-l+1;
    }
    cout<<ans;
}

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NSAyCjEgMyAyIDEgMQ==

5 2
1 3 2 1 1