#include<bits/stdc++.h>
using namespace std;
const int N=1e4+6;
int sum[N];
int yw[N],sx[N],yy[N];
int main(){
	int n,ans=0;
	cin >> n;
	for(int i = 1;i <= n;++i){
		cin >> yw[i] >> sx[i] >> yy[i];
		sum[i] = yw[i] + sx[i] + yy[i];
	}
	n = n * (n - 1) / 2;
	for(int i = 1;i <= n;i++){
		int l = i + 1;
		if(yw[i] - yw[l] <= 5 || yw[i] - yw[l] >= 5){
			if(sx[i] - sx[l] <= 5 || sx[i] - sx[l] >= 5)
				if(yy[i] - yy[l] <= 5 || yy[i] - yy[l] >= 5)
					if(sum[i] - sum[l] <= 10 || sum[i] - sum[l] >= 10)
						ans++;
		}
	}
	cout << ans;
	return 0;	
}