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#include <bits/stdc++.h>
using namespace std;
#define X first
#define Y second
#define ii pair<int, int>
#define ll long long



int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, counter = 0;
    bool spr = true;
    string s;
    cin>>n>>s;
    for(int i = 0;i<n;i++)
    {
        if(s[i]=='N')
            spr = false;
        if((i+1)%(n/10)==0)
        {
            if(spr)
                counter++;
            spr = true;
        }
    }
    cout<<counter<<"\n";
    return 0;
}