#include <stdio.h>
int main()
{
    int n, x, sum = 0;
    scanf("%d", &n);
    if (n <= 0)
    printf("No readings provided\n");
    else 
    {
        for (int i = 0; i < n; i++)
        scanf("%d", &x);
        sum +=x;
    }
    printf("%.2f\n", sum);
    return 0;
}