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#include <iostream>
  #include <stdio.h>
  #include <cstdio>
  using namespace std;

  int main() {
    int tests;
    cin >> tests;
    getchar();
    int testsInSet = tests / 10;

    int score = 0;
    for (int i = 0; i < 10; i++) {
      bool passed = true;
      for (int j = 0; j < testsInSet; j++) {
        int result = getchar();
        if (result == 'N') {
          passed = false;
        }
      }
      if (passed) {
        score++;
      }
    }

    printf("%d", score);
    return 0;
  }