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#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("nrtri.in");
ofstream out("nrtri.out");
int main()
{
int n,v[801],nr=0;
in>>n;
for(int i=1;i<=n;i++)
in>>v[i];
for(int i=1;i<=n-2;i++)
{
for(int j=i+1;j<=n-1;j++)
{
for(int k=j+1;k<=n;k++)
{
if(v[i]+v[j]>=v[k] && v[i]+v[k]>=v[j] && v[j]+v[k]>=v[i])
nr++;
}
}
}
out << nr << endl;
return 0;
}