#include <iostream>
#include <string>
using namespace std;
int has_boris2005(string s) {
int l = s.length() - 9;
if (l < 0) return 0;
for (int i = 0; i <= l; i++) {
if (s.substr(i, 9) == "boris2005") {
return 1;
}
}
return 0;
}
int main() {
cin.tie(0); cout.tie(0); ios::sync_with_stdio(false);
int n;
cin >> n;
int res = 0;
for (int i = 0; i < n; i++) {
string t;
cin >> t;
res += has_boris2005(t);
}
cout << res;
return 0;
}
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