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