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#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx")
#pragma GCC optimize("unroll-loops")    
#include <bits/stdc++.h>
#define pb push_back
#define x first
#define y second
#define mp make_pair
#define len(a) int(a.size())
#define files(FILENAME) read(FILENAME); write(FILENAME)
#define read(FILENAME) freopen((string(FILENAME) + ".in").c_str(), "r", stdin)
#define write(FILENAME) freopen((string(FILENAME) + ".out").c_str(), "w", stdout)
using namespace std;
        
template<typename T1, typename T2>inline void chkmin(T1 &x, T2 y) { if (x > y) x = y; }
template<typename T1, typename T2>inline void chkmax(T1 &x, T2 y) { if (x < y) x = y; } 
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const pair<T, U> &_p) { _out << _p.first << ' ' << _p.second; return _out; }
template<typename T, typename U> inline istream &operator>> (istream &_in, pair<T, U> &_p) { _in >> _p.first >> _p.second; return _in; }
template<typename T> inline ostream &operator<< (ostream &_out, const vector<T> &_v) { if (_v.empty()) { return _out; } _out << _v.front(); for (auto _it = ++_v.begin(); _it != _v.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline istream &operator>> (istream &_in, vector<T> &_v) { for (auto &_i : _v) { _in >> _i; } return _in; }
template<typename T> inline ostream &operator<< (ostream &_out, const set<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const multiset<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const unordered_set<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T> inline ostream &operator<< (ostream &_out, const unordered_multiset<T> &_s) { if (_s.empty()) { return _out; } _out << *_s.begin(); for (auto _it = ++_s.begin(); _it != _s.end(); ++_it) { _out << ' ' << *_it; } return _out; }
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const map<T, U> &_m) { if (_m.empty()) { return _out; } _out << '(' << _m.begin()->first << ": " << _m.begin()->second << ')'; for (auto _it = ++_m.begin(); _it != _m.end(); ++_it) { _out << ", (" << _it->first << ": " << _it->second << ')'; } return _out; }
template<typename T, typename U> inline ostream &operator<< (ostream &_out, const unordered_map<T, U> &_m) { if (_m.empty()) { return _out; } _out << '(' << _m.begin()->first << ": " << _m.begin()->second << ')'; for (auto _it = ++_m.begin(); _it != _m.end(); ++_it) { _out << ", (" << _it->first << ": " << _it->second << ')'; } return _out; }
        
typedef long long base; 
typedef pair<int, int> point;      
typedef complex<double> comp;

const int N = 1e6 + 5;
const int p = 998244353;

int sum(int a, int b) {
    a += b;
    return a < p ? a : a - p;
}

int mul(long long a, int b) {
    return a * b % p;
}

int powx(int a, int b) {
    int ans = 1;
    while (b) {
        if (b & 1) ans = mul(ans, a);
        a = mul(a, a);
        b >>= 1;
    }
    return ans;
}

int n;
int ans = 0;
string s;

int count_primes(int n) {
    int cnt = 0;
    for (int i = 2; n != 1; ++i) {
        while (n % i == 0) {
            ++cnt;
        }
    }
    return cnt;
}

int dp[N];

bool solve(int d) {
    if (n % d != 0 || (n / d) % 2 == 0) return false;
    int cnt = 0;
    for (int i = 0; i < d; ++i) {
        cnt = sum(cnt, cnt);
        cnt += s[i] - '0';
    }
    string ns(s.size(), '0');
    for (int i = 0; i < n; ++i) {
        if (i < d) {
            ns[i] = s[i];
        } else {
            ns[i] = '0' + (1 - (ns[i - d] - '0'));
        }
    }
    if (ns <= s) cnt = sum(cnt, 1);
    dp[d] = cnt;
    return true;
}

int main() {
    ios::sync_with_stdio(0);
    srand(time(0));
#ifdef ONPC
    freopen("input", "r", stdin);
#endif
    cin >> n >> s;
    vector<int> cool;
    for (int i = 1; i <= n; ++i) {
        if (solve(i)) cool.push_back(i);
    }
    for (int i : cool) {
        for (int j : cool) {
            if (j <= i) continue;
            if (j % i == 0) {
                dp[j] = sum(dp[j], p - dp[i]);
            }
        }
    }
    for (int i = 1; i <= n; ++i) {
        ans = sum(ans, mul(2 * i, dp[i]));
    }
    cout << ans << '\n';
}  



Measured memory_bytes: 788