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#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
ifstream is ("nrtri.in");
ofstream os ("nrtri.out");
int n, x, cnt;
vector <int> v;
int main()
{
is >> n;
for (int i = 0; i < n; ++i)
{
is >> x;
v.push_back(x);
}
sort(v.begin(), v.end());
int i, j, k;
for (k = 2; k < n; k++)
{
i = 0;
j = k-1;
while (v[i] + v[j] < v[k]) i++;
cnt += j-i;
}
os << cnt;
is.close();
os.close();
return 0;
}