231A

#include <iostream>
using namespace std;

#define maxSize 10

int main()
{
	int views[maxSize];
	int n, res;
	while(cin>>n)
	{
		res=0;
		for(int i=0; i<n; ++i)
		{
			for(int j=0; j<3; ++j)
				cin>>views[j];
			if((views[0]+views[1]+views[2])>1)
				++res;
		}
		cout<<res<<endl;
	}
	return 0;
}