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#include <bits/stdc++.h>

using namespace std;

#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define ll long long
#define ld long double
ll mod=1000000007;
int inf=1000000007;
ll infl=1000000000000000007;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,ans=0;
    cin>>n;
    string s;
    cin>>s;
    for(int j=0;j<10;j++)
    {
        bool ok=1;
        for(int i=j*n/10;i<(j+1)*n/10;i++) if(s[i]=='N') ok=0;
        ans+=ok;
    }
    cout<<ans;

    return 0;
}