Calculate Total Score

You are given a list of strings representing contest results. Each string is formatted as x:y, where x is an integer (not used in the calculation) and y is either 1 or 0.5. If y is 1 then it indicates a full score which contributes 1 point. If y is 0.5 then it indicates a partial score which contributes \(0.5/2 = 0.25\) points.

Your task is to calculate the total score based on the given input. The input is read from stdin and the result must be output to stdout as a float. If no scores are provided, output 0.0.

Examples:

• Input: 3\n5:1\n3:1\n4:1 → Output: 3.0
• Input: 3\n2:0.5\n3:0.5\n1:0.5 → Output: 0.75
• Input: 4\n5:1\n3:0.5\n4:1\n2:0.5 → Output: 2.5

inputFormat

Input is read from stdin in the following format:

n
score_1
score_2
...
score_n

Where n (an integer) denotes the number of score strings that follow. Each score string is in the format x:y, where x is an integer (which can be ignored) and y is either 1 or 0.5.

outputFormat

Output the total score as a float to stdout.

If there are no scores (n is 0), output 0.0.

## sample

3
5:1
3:1
4:1

3.0

</p>