func_code_string: #include <bits/stdc++.h>   using namespace std;   using namespace std;   const long long N = 4e7 + 5, N_ = 4e6 + 5;   int cnt = 0, prime[N_];   bitset<N> vis;   void pre() {     for (int i = 2; i < N; ++i) {       if (!vis[i]) prime[cnt++] = i;       for (int j = 0; i * prime[j] < N; ++j) {         vis[i * prime[j]] = 1;         if (i % prime[j] == 0) break;       }     }   }   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int n, m;     cin >> n;     if (n == 2) {       cout <<  1 1  << endl;       return 0;     }     if (n == 3) {       cout <<  1 1 2  << endl;       return 0;     }     if (n == 4) {       cout <<  1 1 2 1  << endl;       return 0;     }     if (n == 5) {       cout <<  1 2 1 1 1  << endl;       return 0;     }     if (n == 6) {       cout <<  1 2 1 1 1 1  << endl;       return 0;     }     pre();     m = n * (n + 1) / 2;     bool sign = 0;     vector<int> res(n + 1, 0);     int flag = 0;     if (m & 1) {       if (!vis[m - 2]) {         ++res[2];         res.erase(res.begin());         for (auto i : res) cout << i + 1 <<    ;         cout << endl;         return 0;       }       m -= 3;       flag = 3;       res[3] = 2;     }     for (auto i : prime) {       int t = m - i;       if (!i || t < 0) break;       if (!vis[t]) {         for (int i = n; t && i > flag; --i) {           if (i == flag) continue;           if (i <= t) {             t -= i;             ++res[i];           }         }         if (t) {           res = vector<int>(n + 1, 0);           res[flag] = 2;         } else {           sign = 1;           break;         }       }     }     if (!sign) {       cout << -1 << endl;       return 0;     }     res.erase(res.begin());     for (auto i : res) cout << i + 1 <<    ;     cout << endl;   }   