1546/평균

const fs = require('fs');

const [_,...input] = fs.readFileSync('/dev/stdin').toString().trim().split("\n");
const origin=input[0].split(' ').map(w=>+w);

origin.sort(function (a,b){
	return b-a
})

max=origin[0];
let change=new Array();

origin.forEach(w=>change.push((100*w/max)));

sum=change.reduce((r,v)=>{return r+v},0);


average=sum/origin.length;
console.log(average)