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#include <fstream>
using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int v[801];
int main()
{
int n,sol=0;
fin>>n;
for(int i=1;i<=n;i++){
fin>>v[i];
}
for(int i=1;i<=n;i++){
for(int j=i+1;j<=n;j++){
if(v[i]>v[j]){
swap(v[i],v[j]);
}
}
}
for(int i=1;i<=n;i++){
for(int j=i+1;j<=n;j++){
for(int y=j+1;y<=n;y++){
if(v[i]+v[j]>=v[y]){
sol++;
}
}
}
}
fout<<sol;
return 0;
}