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#include <fstream>
#include <iostream>
using namespace std;
ifstream in("nrtri.in");
ofstream out("nrtri.out");
int n,cnt;
int v[816];
int main()
{
cout<<"DA";
in>>n;
for(int i=1;i<=n;i++)
in>>v[i];
for(int i=1;i<n-1;i++)
for(int j=i+1;j<n;j++)
for(int k=j+1;k<=n;k++)
if(v[i]+v[j]>=v[k] && v[i]+v[k]>=v[j] && v[k]+v[j]>=v[i]) cnt++;
out<<cnt;
return 0;
}