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#include <fstream>
using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int main()
{
int long n,i,v[1001],K=0,j,l;
fin>>n;
for(i=1;i<=n;i++)
fin>>v[i];
for(i=1;i<=n-2;i++)
{
for(j=i+1;j<=n-1;j++)
{
for(l=j+1;l<=n;l++)
{
if(v[i]<v[j]+v[l] && v[j]<v[i]+v[l] && v[l]<v[i]+v[j])K++;
}
}
}
fout<<K;
return 0;
}