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();
    let milesWalk = 0;
    for(let i = 0; i < n ; i++){
        milesWalk = milesWalk + calories[n-1-i] * Math.pow(2,i);
    }
    console.log(milesWalk);

}