#include <iostream>
#include <algorithm>
#include <cstdio>
#include <sstream>
using namespace std;
char La[26]={'2','2','2','3','3','3','4','4','4','5','5','5','6','6','6','7','7','7','7','8','8','8','9','9','9','9'};
int Lb[10003];
int main(){
int N,b2,br,x;
string s,s2="";
cin >> N;
for (int i=0;i<N;i++){
cin >> s;
s2="";
b2=0;
x=s.length();
for (int j=0;j<x;j++){
s2+=La[(int)s[j]-97];
}
stringstream pmc(s2); //pmc - pomocna varijabla
pmc >> b2;
Lb[b2]+=1;
}
cin >> br;
cout << Lb[br];
return 0;
}
