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#include <cstdio>

const int maxn = 100;
char str[maxn+1];


int main() {
    int n;
    scanf("%d", &n);
    scanf("%s", str);
    int n_per_point = n/10;
    int points=0;
    for(int i=0;i<n;i+=n_per_point) {
        bool is_correct=true;
        for(int j=i;j<i+n_per_point;j++)
            if(str[j]=='N') {
                is_correct=false;
                break;
            }
        if(is_correct)
            points++;
    }
    printf("%d\n", points);

    return 0;
}