func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int a, b, c, d;   int main() {     cin >> a >> b >> c >> d;     if (a + 8 * c >= b)       cout <<  0 ;     else if (c > d) {       int num = b - a - 8 * c, den = 12 * (c - d);       cout << (num + den - 1) / den;     } else       cout <<  -1 ;     return 0;   }   