#include<bits/stdc++.h>
using namespace std;
int n,a[200005],ans;
int main(){
	freopen("charger.in","r",stdin);
	freopen("charger.out","w",stdout);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	for(int i=1;i<n;i++){
		for(int j=i+1;j<=n;j++){
			int r=i+1,l=j-1;
			bool t=true; 
			while(r<=l){
				if(a[i]==a[r]||a[i]==a[l]||a[j]==a[r]||a[j]==a[r]){
					t=false;
					break;
				}
				r++,j++;
			}
			if(t){
				ans++;
			}
		}
	}
	cout<<ans;
	return 0;
}