#include <iostream>
#include <vector>
using namespace std;
int main(int argc, char* argv[])
{
	int N;
	cin>>N;
	int i,j,k;
	vector<int> A(N);
	for (i=0;i<N;i++){
		cin>>A[i];
	}
	int ans=0;
	for (i=0;i<N-2;i++){
		for (j=i+1;j<N-1;j++){
			for (k=j+1;k<N;k++){
				if (A[i]<=A[j] && A[j]<=A[k] || A[i]>=A[j]&& A[j]>=A[k] || A[i]==A[j] || A[j]==A[k] || A[i]==A[k]){
				}else{
					//cout<<A[i]<<" "<<A[j]<<" "<<A[k]<<endl;
					ans++;
				}
			}
		}
	}
	cout<<ans<<endl;
	return 0;
}