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#include <string>
#include <stdio.h>
int main()
{
    int n;
    char tab[105];
    scanf("%d",&n);
    scanf("%s",tab);
    std::string s = tab;
    int res =0 ;
    int count = n/10;
    for(int i =0;i< 10; i++)
    {
	bool ok = true;
	for(int j= 0 ; j<count;j++)
	{
	    if(s[i*count + j] == 'N')
	    {
		ok=false;
		break;
	    }
	}
	res+=ok;
    }
    printf("%d\n",res);
    return 0;
}