#include <iostream>
#include<fstream>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int main()
{
    int n,i,j,a[800],k=0,nr=0,l;
    f>>n;
    while(f>>n)
    {
        k++;
        a[k]=n;
    }
    for(i=1;i<=k-2;i++)
        for(j=i+1;j<=k-1;j++)
            for(l=j+1;l<=k;l++)
                if((a[i]+a[j]<=a[k])||(a[i]+a[j]<a[k])||(a[i]+a[k]<a[j])||(a[i]+a[k]<=a[j])||(a[j]+a[k]<a[i])||(a[j]+a[k]<=a[i]))
                    nr++;
    g<<nr;
    return 0;
}