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#include <fstream>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int n,i,j,k,nr;
int v[801];
int triunghi(int a, int b, int c)
{
if (a+b>=c && a+c>=b && b+c>=a)
return 1;
return 0;
}
int main()
{
f>>n;
for (i=1;i<=n;i++)
f>>v[i];
for (i=1;i<=n-2;i++)
for (j=i+1;j<=n-1;j++)
for (k=j+1;k<=n;k++)
if (triunghi(v[i],v[j],v[k]))
nr++;
g<<nr;
return 0;
}