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