func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     if (n <= 2) {       cout << -1;       return 0;     }     if (n == 3) {       cout << 210;       return 0;     }     if ((n - 4) % 6 == 0) {       cout << 1;       for (int i = 0; i < n - 3; i++) cout << 0;       cout << 50;     }     if ((n - 4) % 6 == 1) {       cout << 1;       for (int i = 0; i < n - 3; i++) cout << 0;       cout << 80;     }     if ((n - 4) % 6 == 2) {       cout << 1;       for (int i = 0; i < n - 4; i++) cout << 0;       cout << 170;     }     if ((n - 4) % 6 == 3) {       cout << 1;       for (int i = 0; i < n - 3; i++) cout << 0;       cout << 20;     }     if ((n - 4) % 6 == 4) {       cout << 1;       for (int i = 0; i < n - 4; i++) cout << 0;       cout << 200;     }     if ((n - 4) % 6 == 5) {       cout << 1;       for (int i = 0; i < n - 4; i++) cout << 0;       cout << 110;     }     return 0;   }   