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#include <bits/stdc++.h>
using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int n,i,j,x,nrsol,l[801],verif[4];
int main()
{
fin>>n;
for(i=1; i<=n; i++)
fin>>l[i];
for(i=1; i<n-1; i++)
for(j=i+1; j<n; j++)
for(x=j+1;x<=n;x++)
{
verif[1]=l[i];
verif[2]=l[j];
verif[3]=l[x];
sort(verif+1,verif+1+3);
if(verif[1]+verif[2]>=verif[3])
nrsol++;
}
fout<<nrsol;
return 0;
}