func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k;     cin >> n >> k;     vector<int> joy;     while (n > 0) {       int f, t;       cin >> f >> t;       if (t > k) f = f - t + k;       joy.push_back(f);       n--;     }     sort(joy.begin(), joy.end());     cout << joy.back();   }   