from math import sqrt
a, b, c = map(int, input().split())
print(0.5 * sqrt(2 * pow(b, 2) + 2 * pow(c, 2) - pow(a, 2)))
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from math import sqrt
a, b, c = map(int, input().split())
print(0.5 * sqrt(2 * pow(b, 2) + 2 * pow(c, 2) - pow(a, 2)))