231A-Team.cpp

#include<iostream>
using namespace std;

int main(){
	int n;
	cin>>n;
	int sure[3][n];
	for(int i=0;i<n;i++)
		cin>>sure[0][i]>>sure[1][i]>>sure[2][i];
	
	int attempt=0,c=0;
	for(int i=0;i<n;i++){
		c=sure[0][i]+sure[1][i]+sure[2][i];
		if(c>=2)
			++attempt;
		c=0;
	}
	
	cout<<attempt<<endl;
	
return 0;
}