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#include<iostream>
#include<fstream>
using namespace std;
ifstream fin ("nrtri.in");
ofstream fout ("nrtri.out");
int n,a[801],c=0;
int main()
{
fin>>n;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int i=1;i<=n;i++)
for(int j=i+1;j<=n;j++)
for(int k=j+1;k<=n;k++)
{
int x=a[i];
int b=a[j];
int z=a[k];
if(z>b)
swap(b,z);
if(b>x)
swap(x,b);
if(b<z)
swap(b,z);
if(b+z>=x)
{
c++;
}
}
fout<<c;
}