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#include <iostream>

using namespace std;

int main()
{
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    
    int n;
    cin >> n;
    string s;
    cin >> s;
    int group_size=n/10, group_count = 10, score = 0;
    for(int g=0; g<group_count; ++g)
    {
        bool passed = true;
        for(int t=0; t<group_size; ++t)
        {
            if(s[g*group_size+t]=='N')
            {
                passed = false;
                break;
            }
        }
        if(passed)
        {
            score++;
        }
    }
    
    cout << score;
    return 0;
}