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#include <stdio.h>

int main() {
    int n;
    scanf("%d ", &n);
    int g = n / 10;
    int p = 0;
    bool curr_group = true;
    char c;
    for(int i = 0; i < n; i++) {
        scanf("%c", &c);
        if(c == 'N')
            curr_group = false;
        if((i+1) % g == 0) {
            if(curr_group)
                p++;
            curr_group = true;
        }
    }
    printf("%d\n", p);
    return 0;
}