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#include <iostream>

using namespace std;

int main()
{
    short numberOfAllTests;
    string testsResults;
    cin >> numberOfAllTests >> testsResults;

    short finalScore = 10;
  
    for (short groupNumber = 0; groupNumber < 10; ++groupNumber)
    {
        short numberOfTestsInSingleGroup = numberOfAllTests/10;
        for (short testNumber = 0; testNumber < numberOfTestsInSingleGroup; ++testNumber)
        {
            if (testsResults[groupNumber*numberOfTestsInSingleGroup + testNumber] == 'N')
            {
                finalScore--;   
                break;
            }
        }
    }
    
    cout << finalScore;
    return 0;
}