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#include <bits/stdc++.h>
using namespace std;
int x[30005];
int main (){
ifstream fin("nrtri.in");
ofstream fout ("nrtri.out");
int n,i,j,k,s;
fin >> n;
for(i=0;i<n;i++)
fin >> x[i];
sort(x,x+n);
s=0;
for(i=0;i<n;i++)
for(j=i+1;j<n;j++)
for(k=j+1;k<n&&x[k]<x[i]+x[j];k++)
if(x[i]+x[j]>x[k]&&x[k]+min(x[i],x[j])>max(x[i],x[j]))
s++;
fout << s;
return 0;
}