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#include <cstdio>

int n;
char s[1000];

int main() {
    scanf("%d", &n);
    scanf("%s", s);

    bool good = true;
    int points = 0;
    int groupSize = n / 10;
    for (int i = 0; i < n; i++) {
        if (s[i] == 'N') {
            good = false;
        }
        if ((i + 1) % groupSize == 0) {
            if (good) {
                points++;
            }
            good = true;
        } 
    }
    printf("%d\n", points);
}