Submission #62291125

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#include <bits/stdc++.h>
#define LOOP(n) for (int _i = 0; _i < (n); _i++)
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define RREP(i, n) for (int i = (n); i >= 0; --i)
#define FOR(i, r, n) for (int i = (r); i < (n); ++i)
#define ALL(obj) begin(obj), end(obj)
#define yes "Yes"
#define no "No"
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<ll,int> pli;
typedef pair<int,ll> pil;
typedef vector<vector<int>> vvi;
typedef vector<vector<ll>> vvl;
const vector<char> alpha = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
int dx[4] = {0, 1, 0, -1};
int dy[4] = {1, 0, -1, 0};
const ll MOD = 998244353;
const ll INF = 1e9+7;
 
 
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#include <bits/stdc++.h>
#define LOOP(n) for (int _i = 0; _i < (n); _i++)
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define RREP(i, n) for (int i = (n); i >= 0; --i)
#define FOR(i, r, n) for (int i = (r); i < (n); ++i)
#define ALL(obj) begin(obj), end(obj)
#define yes "Yes"
#define no "No"
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<ll,int> pli;
typedef pair<int,ll> pil;
typedef vector<vector<int>> vvi;
typedef vector<vector<ll>> vvl;
const vector<char> alpha = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
int dx[4] = {0, 1, 0, -1};
int dy[4] = {1, 0, -1, 0};
const ll MOD = 998244353;
const ll INF = 1e9+7;
template<typename T> inline bool chmax(T &a, T b) { return ((a < b) ? (a = b, true) : (false)); }
template<typename T> inline bool chmin(T &a, T b) { return ((a > b) ? (a = b, true) : (false)); }

int main(){
    int N,L=1;
    string S;
    cin >> N >> S;
    int cnt=0;

    LOOP(N) L*=3;
    for (int i=0;i<L;i+=3) {
        if((S[i]-'0')+(S[i+1]-'0')+(S[i+2]-'0')>1) cnt++;
        // cout << (S[i]-'0')+(S[i+1]-'0')+(S[i+2]-'0') << endl;
    }
    vvi A(N+1);
    A[0].resize(L);
    if (cnt>L/6) {
        REP(i,L)A[0][i]=1-(S[i]-'0');
    }else {
        REP(i,L)A[0][i]=S[i]-'0';
    }
    L/=3;
    A[1].resize(L);
    REP(i,L) A[1][i]=max(0,2-(A[0][i*3]+A[0][i*3+1]+A[0][i*3+2]));

    FOR(i,2,N+1){
        L/=3;
        A[i].resize(L);
        REP(j,L) {
            multiset<int> st;
            st.insert(A[i-1][3*j]);
            st.insert(A[i-1][3*j+1]);
            st.insert(A[i-1][3*j+2]);
            auto it=st.begin();
            A[i][j]=*it;
            it++;
            A[i][j]+=*it;
            // for(auto a:st) cout << a <<' ';
            // cout << endl;
        }
    }
    // REP(i,9) cout << A[0][i] <<' ';
    // cout << endl;
    // REP(i,3) cout << A[1][i] <<' ';
    cout << A[N][0] << endl;
}

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