#include <bits/stdc++.h>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-9;
const ll mod=1e9+7;
const int dx[4]={0,1,0,-1},dy[4]={1,0,-1,0};

int n,a[60];

int main(){
	cin>>n;
	for(int i=0;i<14;i++){
		char c;
		cin>>c;
		if(c=='o') a[i+14]++;
	}
	int res=0;
	for(int i=0;i<60;i++){
		int t=0;
		for(int j=0;j<60;j++){
			if(a[j]||i<=j&&j<i+n) t++;
			else res=max(res,t),t=0;
		}
	}
	cout<<res<<endl;
}