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#include <stdio.h>
#include <stdlib.h>

int main() {
    int n,g,p,i,j,ok;
    char buff[128];

    scanf("%d\n", &n);
    g = n/10;

    fgets(buff, 128, stdin);
     
    p = 0;
    for (i=0; i<10; ++i) {
        ok = 1;
        for (j=0; j<g; ++j) {
            if (buff[g*i + j] == 'N')
                ok = 0;
        }
        if (ok) p++;
    }
    
    printf("%d\n", p);

    return 0;
}