func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, m, k, l;   int main() {     cin >> n >> m >> k >> l;     long long x = m * ((k + l) / m + ((k + l) % m == 0 ? 0 : 1));     if (x <= n)       cout << x / m << endl;     else       cout << -1 << endl;     return 0;   }   