carreraN1V1

//4:07mins
#include <bits/stdc++.h>
using namespace std;

int c,d,h,a,b,res=0;

int main(){
    ifstream fin("in.txt");
    fin >> d >> d >> h;
    while(fin >> a >> b >> c){
        if(abs(a-b) <= b && (c-(a+b)) <= h){
            res++;
        }
    }
    cout << res << endl;
}