function findAverage(number, numeral) {
   let array = numeral.split(' ')
   let sum = 0
   let result = 0
   for (let counter = 0; counter < array.length; counter++) {
      sum += Number(array[counter])
   }

   result = sum / number
   console.log(result.toFixed(2))
}


 let number = +gets()
 let numeral = gets()
 let array = numeral.split(' ')
   let sum = 0
   let result = 0
   for (let counter = 0; counter < array.length; counter++) {
      sum += Number(array[counter])
   }

   result = sum / number
   print(result.toFixed(2))