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#include<bits/stdc++.h>

using namespace std;

int n,sp[10003];
string inp;

int main(){

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin>>n;
    cin>>inp;
    int k = n/10;
    int curr=0,ans=0;
    for(int i= 1;i<=n;i++){
        sp[i] = sp[i-1];
        if(inp[i-1]=='T'){
            sp[i]+=1;
        }
    }
    for(int r = k;r<=n;r+=k){
        int l = r-k+1;
        if(sp[r]-sp[l-1]==k){
            ans++;
        }
    }
    cout<<ans;
    return 0;
}