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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    string h;
    cin>>n;
    cin>>h;
    int ilo=n/10;
    int k=0;
    int wy=0;
    while(k<h.size()){
        int o=0;
        for(int i=k;i<=k+ilo-1;i++){
                //cout<<h[i];
            if(h[i]=='N'){
                o++;
                break;
            }
        }
        //cout<<o<<endl;
        if(o==0)wy++;
        k+=ilo;
    }
    cout<<wy<<endl;


    return 0;
}