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#include <cstdio>

int main() {
    int n;
    scanf("%d\n", &n);
    int v = 0;
    for (int i=0; i<10; i++) {
        int k = n / 10;
        int a=1;
        do {
            char c;
            scanf("%c", &c);
            if (c == 'N') {
                a = 0;
            }
        } while (--k);
        v += a;
    }
    printf("%d\n", v);
    return 0;
}