process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////

function main() {
    var n = parseInt(readLine());
    calories = readLine().split(' ');
    calories = calories.map(Number).sort(function(b,a){ return a-b;});
    // your code goes here
    var total = 0;
    var pow = 1;
    for (var i=0;i<n;i++) {
        total += pow*calories[i];
        pow *=2;
    }
    console.log(total);

}