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#include <bits/stdc++.h>
using namespace std;
ifstream in("nrtri.in");
ofstream out("nrtri.out");
int v[801];
int main()
{
int N,T=0,i,j,k;
in>>N;
for(i=1; i<=N; i++)
{
in>>v[i];
}
sort(v+1, v+N+1);
for(i=1; i<=N-2; i++)
{
for(j=i+1; j<=N-1; j++)
{
for(k=j+1; k<=N; k++)
{
if(v[i]+v[j]>=v[k])
{
T++;
}
else
{
break;
}
}
}
}
out<<T;
return 0;
}