#include<cstdio>
int main(){
int n;
double x,sum=0;
scanf("%d",&n);
for (int i=1;i<=n;i++){
scanf("%lf",&x);
sum=sum+x;
}
printf("%.4lf",sum/n);
return 0;
}
#include<cstdio>
int main(){
int n;
double x,sum=0;
scanf("%d",&n);
for (int i=1;i<=n;i++){
scanf("%lf",&x);
sum=sum+x;
}
printf("%.4lf",sum/n);
return 0;
}