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#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int v[800],n;
void citire(int &n,int v[800])
{
f >> n;
for(int i=1;i<=n;i++)
f >> v[i];
}
void verif_triunghi(int n,int v[800])
{
int _count=0;
for(int i=1;i<=n-2;++i)
for(int j=i+1;j<=n-1;++j)
for(int k=i+2;k<=n;++k)
if(v[i] < v[j]+v[k] && v[j] < v[i]+v[k] && v[k] < v[i]+v[j])
_count++;
g << _count;
}
int main()
{
citire(n,v);
verif_triunghi(n,v);
}