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