#include <iostream>
#include <cstring>
#include <regex>
using namespace std;
 
const int MAX_LEN = 100;
 
int main() {
    int word_count, occurrence_count = 0;
    cin >> word_count;
    char sir[MAX_LEN + 1];
    cin >> sir;
    regex r("(sir.+)");
    char word[MAX_LEN + 1];
    for (int i = 0; i <= word_count; ++i) {
        cin.getline(word,MAX_LEN);
        if (regex_match(word,r)) {
            ++occurrence_count;
        }
    }
    cout << occurrence_count;
    return 0;
    }

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

NQpwcmUKcHJlYWRtaXRlcmUKZXByZXppY2VyZQpwcmUKcHJlemVudGFyZQpwcmFjdGljYQ==

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