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#include <cstdio>

int main() {
    int n;
    char s[128];

    scanf("%d %s", &n, s);

    const int k = n / 10;

    int res = 10;

    for (int i = 0; i < n;) {
        if ( s[i] == 'N' ) {
            res--;
            i += k - i % k;
        } else {
            i++;
        }
    }

    printf("%d\n", res);

    return 0;
}