#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream fin("ntri.in");
    ofstream fout("ntri.out");

    int k, i, d = 2, nr = 0, cnt = 2, d1=2, nr1=0;

    fin>>k;
  int n[k];

  for ( i = k; i > 0; --i){
    fin>>n[k]
    if (n [0] < n[1] + n[2] )
    nr++;
  }
  fout<<nr;















    return 0;
}