func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     if (n < 3) {       cout << -1;       return 0;     }     if (n == 3) {       cout << 210;       return 0;     }     int A[] = {50, 80, 170, 20, 200, 110};     int nA[] = {2, 2, 3, 2, 3, 3};     int j = 0;     for (int i = 4; i <= n; i++) {       if (j == 6) j = 0;       if (i == n) {         cout << 1;         for (int k = 1; k < n - nA[j]; k++) {           cout <<  0 ;         }         cout << A[j];       }       j++;     }     return 0;   }   