const readline = require('readline');

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

rl.question('', (N) => {
  rl.question('', (str) => {
    const arr = str.split(' ');
    const nums = arr.map((num) => parseInt(num));
    // nums.sort((a, b) => a - b);
    // let averSum = nums[0];
    // for(let i = 1; i < parseInt(N); i++) {
    //   averSum = (averSum + nums[i]) / 2;
    // }
    // console.log(averSum);
  });
});