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#include<bits/stdc++.h>

using namespace std;
#define ll long long
#define ld long double
#define pi pair<int,int>
#define vi vector<int>
#define vvi vector<vi>
#define vll vector<ll>
#define ST first
#define ND second
#define PB push_back

void Solve()
{
    int n;
    cin >> n;
    string s;
    cin >> s;
    int res=10;
    int l=n/10;
    for(int i=0; i<10; ++i)
        for(int j=0; j<l; ++j)
            if(s[l*i+j]=='N')
            {
                --res;
                break;
            }
    cout << res << "\n";
    return;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int t;
    //cin >> t;
    t=1;
    while(t--)
    {
        Solve();
    }
    return 0;
}