#include<stdio.h>
int main(){
     int n;
     scanf("%d" ,&n);
     if (n<=0)  {
         printf{"No reading provided\n");
         return 0;
     }
     int temp,sum=0;
     for (int i=0;i<n;i++){
         scanf("%d",&temp);
         sum+= temp;
     }
     float avg={float)sum/n;
     printf("%.2f\n",vg);
     return 0;
     }
         
     }
     }
}// editor5