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#include <bits/stdc++.h>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int n,nr,a[800];
int main()
{
f>>n;
for(int i=1;i<=n;i++)
f>>a[i];
sort(a+1,a+n+1);
for(int i=1;i<n-1;i++)
for(int j=i+1;j<n;j++)
for(int k=j+1;k<=n;k++)
if(a[i]<=a[j]+a[k]&&a[i]>0)
if(a[j]<=a[i]+a[k]&&a[j]>0)
if(a[k]<=a[i]+a[j]&&a[k]>0)
nr++;
g<<nr;
return 0;
}