The Donut Dilemma

Jane wants to be fit, but she also likes donuts. She eats m donuts at a given time, and each donut i has a calorie count,ci. After eating a donut with c calories, she must run at least 2j*c (where j is the number donuts she has already eaten) kilometers to maintain her weight. Given the individual calorie counts for each of the m donuts, find and print the minimum number of kilometers Jane must r