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#include <iostream>

using namespace std;
int n, ans, is_point, gr;
string s;
int main()
{
    cin>>n;
    cin>>s;
    gr=n/10;
    is_point=1;
    for(int i=0; i<n; i++){
        if(s[i]=='N')
            is_point=0;
        if((i+1)%gr==0){
            ans+=is_point;
            is_point=1;
        }
    }
   cout<<ans;
}