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