If the student has mass 75 kg, and if the stairs are 3 m high, then
work = mgh = 75kg * 9.8m/s² * 3m = 2200 J
so I'd say "one one-hundredth."
Except that I think 5000 cal ≈ 20.95 kJ (not J), and that would change my answer to
"ten times or so".
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