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#include<iostream>
#include<cstdio>
using namespace std;
inline int read()
{
	int n=0,f=1,ch=getchar();
	while(ch<'0'||ch>'9')
	{
		if(ch=='-')f=-1;
		ch=getchar();
	}
	while(ch>='0'&&ch<='9')
	{
		n=n*10+ch-'0';
		ch=getchar();
	}
	return n*f;
}
char s[100005];
int main()
{
	int n;
	n=read();
	scanf("%s",s+1);
	int ans=0;
	for(int i=1;i<=10;i++)
	{
		bool flag=true;
		for(int j=n/10*(i-1)+1;j<=n/10*i;j++)
		{
			if(s[j]=='N')
			{
				flag=false;
				break;
			}
		}
		if(flag==true)ans++;
	}
	printf("%d\n",ans);
}