func_code_string: #include <bits/stdc++.h>   using namespace std;   bool dbg = 0;   int main() {     int N, K;     cin >> N >> K;     long long Count = 0;     int x, y;     for (int n = 0; n < N; ++n) {       scanf( %d%d , &x, &y);       Count += (long long)(y - x + 1);     }     cout << (K - Count % K) % K << endl;     return 0;   }   