func_code_string: #include <bits/stdc++.h>   using namespace std;   long long ans, t, s, a, i, b, k;   int main() {     cin >> k >> a >> b;     s = (0 - a) / k + 1;     while (a <= 0) {       a = a + s * k;       b = s * k + b;     }     ans = b / k - (a - 1) / k;     cout << ans;   }   