// NOTE: it is recommended to use this even if you don't understand the following code.

#include <fstream>
#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main() {
    // uncomment the two following lines if you want to read/write from files
    // ifstream cin("input.txt");
    // ofstream cout("output.txt");

    int N;
    cin >> N;

    vector<int> T(N);
    for (int i = 0; i < N; ++i)
        cin >> T[i];

    int B = 0;

    long long polcdb,kosszeg,kh,kellkonyv=0;
    // INSERT YOUR CODE HERE
     for (int i = 0; i < N; ++i){
        polcdb = T[i];
     

  
    kh= 1;
    kosszeg= 1;
    while(kosszeg<polcdb){
        kh*=2;
        kosszeg+=kh;
    }
    
    kellkonyv+=kosszeg-polcdb;
    }

    cout<< kellkonyv;
    
    
    return 0;
}