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#include <bits/stdc++.h>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int n,v[801],nr=0,i,j,k,ok;
int main()
{
f>>n;
for(i=1; i<=n; i++)
f>>v[i];
sort(v+1,v+n+1);
for(i=1; i<=n; i++)
for(j=i+1; j<=n; j++)
{
ok=1;
for(k=j+1; k<=n && ok==1; k++)
{
if(v[i]+v[j]>=v[k])
nr++;
if(v[i]+v[j]<v[k])
ok=0;
}
}
g<<nr;
f.close();
g.close();
}