Programme for the accounting of travel documents

Programmer services are required. You need to write a program that will automatically calculate and distribute the mileage.
That is, for example, as I see it, the ts have traveled 1000 kilometers, we enter the number "1000" per day should be no more than 400 km and a fixed distance between the cities (the path traveled) - it is difficult to explain in the text, but in a personal conversation, it seems to me quickly everything will become clear.
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