"use strict";
function Main(input) {
    const num = Number(input.split("\n")[0]);
    const preseries = input.split("\n")[1].split(" ").map(i => Number(i));
    const series = preseries.sort((a, b) => a - b);
    if (num % 2 === 1) {
        console.log(series[Math.ceil(num / 2) - 1]);
    }
    else {
        console.log((series[(num / 2) - 1] + series[(num / 2)]) / 2);
    }
}
//テストの入力を受け取る
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
//Main("6\n4 8 2 4 6 5");
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