int main()
{
Tree<int> tree;
Treap<int> treap;
int n = 0;
cin >> n;
int value = 0;
int priority = 0;
for(int i = 0; i < n; i++) {
cin >> value >> priority;
tree.Add(value);
treap.Add(value, priority);
}
cout << tree.Height() - treap.Height();
return 0;
}
