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#include <iostream>

using namespace std;

int main()
{
    int n,w=0,x;
    cin>>n;
    string s;
    cin>>s;
    bool pom;
    for(int i=0;i<n;){
        pom=1;
        x=n/10;
        while(x){
            if(s[i]=='N')pom=0;
            i++;
            x--;
        }
        if(pom)w++;

    }
    cout<<w;
    return 0;
}