try

//thanks God For Every Thing!
//contest link:

#include<bits/stdc++.h>
#include <iostream>
#include <fstream>
#include <string>
#include <algorithm>
#include <cmath>
#include <cstdio>

/*



*/
#define pi           acose(-1)
#define flush        cin.ignore(numeric_limits<streamsize>::max(),'\n');
#define wow          ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define NL           printf("\n")
#define fin          freopen("int.txt","r",stdin);
#define fout         freopen("out.txt","w",stdout);


using namespace std;

typedef long long int ll;
typedef double dl;

// ---------------------- slove---------------------------//


int main()
{
    //fin
    //fout

    int n;
    cin>>n;
    int arr[1005][1005];
    for(int i=0; i<n; i++)
    {
        for(int j=0; j<n; j++)
        {
            cin>>arr[i][j];
        }
    }
    int cnt=0, ans=0;
    for(int i=0; i<n; i++)
    {
        cnt=0;
        for(int j=0; j<n; j++)
        {
            if(arr[i][j]==1)
            {
                cnt++;
            }
        }
        if(cnt>=2)
        {
            ans++;
        }
    }

    cout<<ans<<endl;

    return 0;
}
//author anikaksh;