let main = (standardInput) => {
    var line = standardInput.trim().split('\n');
    var array = line[1].trim().split(' ').map(Number);
    // console.log(array);
    array.sort(
        function(a, b){
        return a - b;
        }
        );
    // console.log(array);
    var count = line[0];
    if (count % 2 === 0) {
        var a = count / 2;
        var b = a - 1;
        console.log((array[a] + array[b]) / 2);
    } else {
        var c = Math.floor(count / 2);
        console.log(array[c]);
    }
};
main(require('fs').readFileSync('/dev/stdin', 'UTF-8'));