func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int m = 1000000007;   long long int n1, n2 = 0, sum = 0;   long long int gcd(long long int a, long long int b) {     return (b == 0) ? a : gcd(b, a % b);   }   bool compare(pair<string, long long int> p1, pair<string, long long int> p2) {     if (p1.second != p2.second) {       return p1.second > p2.second;     } else       return p1.first < p2.first;   }   signed main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long int t = 1;     while (t--) {       long long int n;       cin >> n;       bool prime[n + 2];       memset(prime, true, sizeof(prime));       for (long long int p = 2; p * p <= n + 1; p++) {         if (prime[p] == true) {           for (long long int i = p * p; i <= n + 1; i += p) prime[i] = false;         }       }       if (n > 2)         cout << 2 <<   n ;       else         cout << 1 <<   n ;       for (long long int i = 2; i < n + 2; i++) {         if (prime[i])           cout << 1 <<    ;         else           cout << 2 <<    ;       }     }     return 0;   }   