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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin ("nrtri.in");
ofstream fout ("nrtri.out");
int n, v[809];
int sol;
int main()
{
fin>>n;
for(int i=1; i<=n; i++)
fin>>v[i];
sort(v+1, v+1+n);
for(int i=1; i<n; i++)
for(int j=i+1; j<n; j++)
for(int k=j+1; k<=n; k++)
if(v[i]+v[j]>=v[k])
sol++;
fout<<sol;
return 0;
}