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); calories.sort(); var res = 0; var i0 = 0; var i = calories.length-1; while(i>=0){ res += parseInt(calories[i]*Math.pow(2,i0)); i0++; i--; } console.log(res); }