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#include <fstream>
using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int i,n,m,j,s,v[1000],maxi,nr,aux;
int main()
{
fin>>n;
for(i=1;i<=n;i++)
fin>>v[i];
int ok;
do
{
ok=0;
for(i=1;i<n;i++)
if(v[i]>v[i+1])
{
aux=v[i];
v[i]=v[i+1];
v[i+1]=aux;
ok=1;
}
}while(ok==1);
for (i=1;i<=n-2;++i)
for (j=i+1;j<=n-1;++j)
for(m=j+1;m<=n;++m)
{
if(i!=j && j!=m && m!=i)
if(v[i]<=v[j]+v[m] && v[j]<=v[m]+v[i] && v[m]<=v[i]+v[j])
nr++;
}
fout<<nr;
return 0;
}