Number by 3#919
The sequence of real numbers a_1, a_2, \ldots, a_n is given. Find the number and the sum of positive elements whose indexes are divisible by .
The first line contains the number of elements (n \leq 100) in the sequence. The second line contains real numbers, each with an absolute value not exceeding .
Print in one line the number of required elements and their sum, with exactly two digits after the decimal point.
Example 1