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#include <fstream>
using namespace std;
ifstream in("nrtri.in");
ofstream out("nrtri.out");
int main()
{
int n, v[1001], i, moduri=0, j, aux, t;
in>>n;
for(i=1; i<=n; i++)
in>>v[i];
for(i=1;i<=n-1;i++)
{
for(j=i+1;j<=n-1;j++)
{
if(v[i]>v[j])
{
aux=v[i];
v[i]=v[j];
v[j]=aux;
}
}
}
for(i=1; i<=n; i++)
{
for(t=2; t<=n; t++)
{
for(j=3; j<=n; j++)
{
if(v[i]+v[t]>v[j])
{
moduri++;
}
}
}
}
out<<moduri;
return 0;
}