#include <bits/stdc++.h>
using namespace std;
int main(){
	int n,sum = 0;
	cin >> n;
	int arr[n + 1][4];
	for (int i = 1;i <= n;i++){
		for (int j = 1;j <= 3;j++){
			cin >> arr[i][j];
		}
	}
	if (arr[1][1] - arr[2][1] <= 5 && arr[1][2] - arr[2][2] <= 5 && arr[1][3] - arr[2][3] <= 5){
		if ((arr[1][1] + arr[1][2] + arr[1][3]) - (arr[2][1] + arr[2][2] + arr[2][3]) <= 10){
			sum++;
		}
	}
	if (arr[2][1] - arr[3][1] <= 5 && arr[2][2] - arr[3][2] <= 5 && arr[2][3] - arr[3][3] <= 5){
		if ((arr[2][1] + arr[2][2] + arr[2][3]) - (arr[3][1] + arr[3][2] + arr[3][3]) <= 10){
			sum++;
		}
	}
	if (arr[1][1] - arr[3][1] <= 5 && arr[1][2] - arr[3][2] <= 5 && arr[1][3] - arr[3][3] <= 5){
		if ((arr[1][1] + arr[1][2] + arr[1][3]) - (arr[3][1] + arr[3][2] + arr[3][3]) <= 10){
			sum++;
		}
	}
	cout << sum;
	return 0;
}