1546

#include <stdio.h>
#include <string.h>
int main(){
   int N;
   double arr[1000],M=0,avg=0;
   scanf("%d",&N);
   for(int i=0;i<N;i++){
      scanf("%lf",&arr[i]);
      if(M<arr[i]){
         M=arr[i];
      }
   }
   for(int i=0;i<N;i++){
      arr[i]=arr[i]/M*100;
      avg+=arr[i];
   }
   printf("%lf",avg/(double)N);

   return 0;
}