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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
int a[800],i ,j ,k ,n ,Nr = 0;
ifstream in("nrtri.in");
ofstream out("nrtri.out");
in>>n;
for(i=0; i < n;i++)
{
in>>a[i];
}
for(i = 0;i < n;i++)
{
for(j = i + 1;j < n;j++)
{
for(k = j + 1;k < n;k++)
{
if(a[i] <= a[j]+a[k] && a[j] <= a[i] + a[k] && a[k] <= a[i] + a[j])
{
Nr++;
}
}
}
}
out<<Nr;
return 0;
}