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