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#include <iostream>
#include <string>

using std::cin, std::cout;

int main()
{
    std::ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n;
    cin >> n;
    int partSize = n/10;

    std::string tests;
    cin >> tests;

    int score = 10;
    for (int i = 0; i < n;)
    {
        if (tests[i]=='N')
        {
            i = (i/partSize+1)*partSize;
            score--;
        }
        else i++;
    }
    
    cout << score;
}