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#include <bits/stdc++.h>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int main() {
int b[801], n, sol = 0;
f>>n;
for(int i = 0; i < n; i++) {
f>>b[i];
}
for(int i = 0; i < n - 2; i++)
for(int j = i + 1; j < n - 1; j++)
for(int k = j + 1; j < n; k++)
if(((b[i] + b[j]) >= b[k]) && ((b[i] + b[k]) >= b[j]) && ((b[j] + b[k]) >= b[i])) sol++;
g<< sol;
}