text: #include <bits/stdc++.h>
  #include <vector>
  
  using namespace std;
  
  int main()
  {
      vector<int> ar;
  
      int n;
  
      cout << "Enter the Number " << endl;
      cin >> n;
      int total = 0, sum = 0;
      for (int i = 0; i < n - 1; i++) {
          int tt;
          cin >> tt;
          ar.push_back(tt);
          sum += tt;
      }
  
      total = (n * (n + 1)) / 2;
  
      int rem = total - sum;
  
      cout << "Missing Number " << rem << endl;
  
      return 0;
  }
  