[old] Call to Home [old] Call to Home
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Nicola believes that Sophia calls to Home too much and her phone bill is much too expensive. He took the bills for Sophia's calls from the last few days and wants to calculate how much it costs.

The bill is represented as an array with information about the calls. Help Nicola to calculate...

The date and time in this information are the start of the call.

For example:

2014-01-01 01:12:13 181
2014-01-02 20:11:10 600
2014-01-03 01:12:13 6009
2014-01-03 12:13:55 200
First day -- 181s≈4m -- 4 coins;
Second day -- 600s=10m -- 10 coins;
Third day -- 6009s≈101m + 200s≈4m -- 100 + 5 * 2 = 110 coins;
Total -- 124 coins.

Input: Information about calls as a tuple of strings.

Output: The total cost as an integer.

Example:

totalCost(["2014-01-01 01:12:13 181",
            "2014-01-02 20:11:10 600",
            "2014-01-03 01:12:13 6009",
            "2014-01-03 12:13:55 200"]) == 124
    

How it is used: This mission will teach you how to parse and analyse various types data. Sometimes you don't need the full data and should single out only important fragments.

Precondition: 0 < len(calls) ≤ 30
0 < call_duration ≤ 7200
The bill is sorted by datetime.

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