import java.util.*;
 

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] num = new int[11];
		int ans=0;
		for(int i=0;i<n;i++){
			for(int j=0;j<3;j++){
				int aa = sc.nextInt();
				if(num[aa]==1){
					ans++;
					num[aa]=0;
				}else{
					num[aa]++;
				}		
			}
		}
		int temp=0;
		for(int i=1;i<=10;i++){
			if(num[i]==1) temp++;
		}
		if(temp<4){
			System.out.println(ans);
		}else if(temp<8){
			System.out.println(ans+1);
		}else{
			System.out.println(ans+2);
			
		}
	}
}