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#include<bits/stdc++.h>

using namespace std;

int n, ilepkt;
string testy;
bool dobre;

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

    cin>>n>>testy;

    int pom = n/10;

    for(int i=0;i<n;i += pom)
    {
        dobre = true;
        for(int l=0;l<pom;l++)
            if(testy[i+l] == 'N')
            {
                dobre = false;
                break;
            }
        ilepkt += dobre;
    }

    cout<<ilepkt;

    return 0;
}