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#include <iostream>
#include <fstream>
#include <algorithm>
#define NMAX 800
using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int n, v[NMAX];
int main()
{
fin >> n;
for (int i = 0; i < n; ++i) fin >> v[i];
sort(v, v + n);
long long nrTri = 0;
int target, st, dr, middle, ans = -1;
for (int i = 0; i < n - 2; ++i)
for (int j = i + 1; j < n - 1; ++j) {
int k = j + 1;
while (k < n && v[i] + v[j] >= v[k]) k++;
nrTri += k - j - 1;
}
fout << nrTri;
}
/*
7
10 21 22 100 101 200 300
*/