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#include<cstdio>

int main(){

int n;
int fail = 0;
char c;
scanf("%d", &n);
for (int i=0; i < 10; i++){
	int fail_t = 0;
	for (int j=0; j < n/10; j++){
            scanf(" %c", &c);
            if(c=='N'){
	        fail_t = 1;
            }
        }
	fail += fail_t;
}
printf("%d", 10 - fail);
return 0;
}