func_code_string: #include <bits/stdc++.h>   using namespace std;   int n;   int main() {     cin >> n;     int k = 0;     if (n == 1 || n == 2)       cout << -1;     else if (n == 3)       cout << 210;     else       for (int i = 4; i <= n; i++) {         k++;         if (k == 7) k = 1;       }     if (k == 1) {       cout << 1;       for (int i = 2; i <= n - 2; i++) cout << 0;       cout << 50;     } else if (k == 2) {       cout << 1;       for (int i = 2; i <= n - 2; i++) cout << 0;       cout << 80;     } else if (k == 3) {       cout << 1;       for (int i = 2; i <= n - 3; i++) cout << 0;       cout << 170;     } else if (k == 4) {       cout << 1;       for (int i = 2; i <= n - 2; i++) cout << 0;       cout << 20;     } else if (k == 5) {       cout << 1;       for (int i = 2; i <= n - 3; i++) cout << 0;       cout << 200;     } else if (k == 6) {       cout << 1;       for (int i = 2; i <= n - 3; i++) cout << 0;       cout << 110;     }     return 0;   }   