func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k;     cin >> n >> k;     int sum = 0;     for (int i = 0; i < n; ++i) {       int l, r;       cin >> l >> r;       sum += r - l + 1;     }     int ct = 0;     while (sum % k != 0) {       ct++;       sum++;     }     cout << ct << endl;   }   