func_code_string: #include <bits/stdc++.h>   using namespace std;   void fast_in_out() {     std::ios_base::sync_with_stdio(NULL);     cin.tie(NULL);     cout.tie(NULL);   }   int main() {     fast_in_out();     int n, x, y, c = 0;     cin >> n;     for (int(i) = 0; (i) < (n); ++(i)) {       cin >> x >> y;       if (y >= x + 2) c++;     }     cout << c << endl;     return 0;   }   