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#include <bits/stdc++.h>

#define pil pair<int, ll>
#define vil vector<pil>
#define vvil vector<vil>
#define vi vector<int>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vii vector<pii>
#define vvi vector<vi>
#define vvii vector<pii>
#define vb vector<bool>
#define vvb vector<vb>
#define vll vector<pll>
#define vl vector<ll>
#define vvl vector<vl>
#define endl '\n'
#define turbo ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define pb push_back
#define ll long long
#define f first
#define s second
#define mide (lo+hi)/2
#define mid (l+r)/2
#define lowbit(x) x&(-x)
 
using namespace std;

string str;
int n;

bool git(int a, int b) {
    for(;a<b;a++)
        if(str[a]=='N')
            return false;
    return true;
}

int main() {
    turbo
    cin >> n >> str;
    n/=10;
    int res = 0;
    for(int i = 0; i < str.size(); i+=n)
        if(git(i, i+n))
            res++;
    cout << res;
}