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#include <bits/stdc++.h>
//#define int long long
#define ll long long
#define db double
#define fi first
#define se second
#define pii pair<int,int>
#define vi vector<int>

using namespace std;

const int maxn=2e5; 
int n;
char s[maxn+5];  
int main() {
	scanf("%d",&n); 
	scanf("%s",s+1);
	int len=n/10;
	int ans=0; 
	for (int j=1;j<=10;j++) {
		int l=(j-1)*len+1,r=j*len;
		int ok=1; 
		for (int k=l;k<=r;k++) {
			if (s[k]!='T') {
				ok=0; break ; 
			}
		}
		ans+=ok; 
	}
	cout<<ans<<'\n'; 
	return 0;
}