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