#include <iostream>
#include <fstream>

using namespace std;

ifstream in("nrtri.in");
ofstream out("ntri.out");

int main()
{
    int n,v[805], c=0;
    in>>n;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            if(j==i)
                j++;
            for(int z=1;z<=n;z++)
        {
            while(j!=z&&i!=z)
                z++;
            if(v[i]<=v[j]&&v[j]<=v[z]&&v[i]+v[j]==v[z])
                c++;

        }
        }
    }
    out<<c;
    return 0;
}