include <bits/stdc++.h>

using namespace std;
int main() {
int n;
cin >> n;
int a[n],max=0,count=0;
for (int i=0; i<n; i++) cin >> a[i];
for (int i=0; i<n; i++) for (int j=i+1; j\<n; j++) for (int k=j+1; k\<n; k++) if (a[i]+a[j]>a[k] && a[i]+a[k]>a[j] && a[j]+a[k]>a[i]) {
if (max<a[i]+a[j]+a[k]) count++;
}
cout << count;
}