#include<cstdio>
int main(){
 int n,x,sum=0;
 scanf("%d",&n);
 for (int i=1;i<=n;i++){
  scanf("%d",&x);
  sum=sum+x;
 }
 printf("%.2lf",(double)sum/n);
 return 0;
}

http://noi.openjudge.cn/ch0105/01/

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