#include <bits/stdc++.h>
using namespace std;
#define f(i,k,n) for(int i=k; i<n; i++)
#define ll long long
const int inf = INT_MAX;

void solve()
{
    int n,c=0;
    string s;
    getline(cin,s);
    n=stoi(s);
    f(i,0,n)
    {
        int b=1;
        int m[26]={0};
        getline(cin,s);
        //cout<<s<<"\n";
        f(j,0,s.length())   if(s[j]!=' ')   m[tolower(s[j])-'a']++;
        f(j,0,26)   if(m[j]>2)    b=0;    
        c+=b;
    }
    cout<<c<<"\n";
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int t=1;
    //cin>>t;
    while(t--)  solve();
    return 0;
}