Indian summer

#include<bits/stdc++.h>
using namespace std;
#define op ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define endl "\n"
int main()
{
       int n;
       cin>>n;
     /*  int c=1;
       pair<string,string>p[15];
       for(int i=0;i<n;i++){
           //string s,t;
           //cin>>s>>t;

           cin>>p[i].first>>p[i].second;
         }
       sort(p,p+n);
        for(int i=1;i<n;i++){
           if(p[i-1]!=p[i]) c++;
}
       cout<<c<<endl;*/
      vector<pair<string,string> > v(n);
      for(int i=0;i<n;i++) cin>>v[i].first>>v[i].second;
      sort(v.begin(),v.end());
      int c=unique(v.begin(),v.end())-v.begin();
      cout<<c<<endl;

}