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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int main()
{
int n,v[1000],k=0;
fin>>n;
for(int i=1;i<=n;i++)
fin>>v[i];
for(int i=1;i<=n-2;i++)
{
for(int j=i+1;j<=n-1;j++)
{
for(int q=j+1;q<=n;q++)
{
if(v[i]+v[j]>=v[q]&&v[i]+v[q]>=v[j]&&v[j]+v[q]>=v[i])
k++;
}
}
}
fout<<k;
return 0;
}