const main = require('fs').readFileSync('/dev/stdin','utf8').split('\n');
const count = main[0];
const array = main[1].trim().split(' ').map(Number);
array.sort((a, b) => a - b);
let a = count / 2;
let b = a - 1;
if (count % 2 === 0) {
    console.log((array[a] + array[b]) / 2);
} else {
    let c = Math.floor(a);
    console.log(array[c]);
}