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 10
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 6
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 5
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 2
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 3
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7 5 541 10 10 4 4 1 21 5 9 93 21 3
def fucntion(x):
    return pow(x, 3) - x - 11


uper = 3
lower = 2

p = 0
n = 0

temp1 = fucntion(uper)
temp2 = fucntion(lower)

if temp1 > 0:
    p = uper
    n = lower

if temp1 < 0:
    p = lower
    n = uper

m = (p + n) / 2
print(m)
for i in range(0, 15):
    if fucntion(m) > 0:
        p = m
        n = n
    else:
        p = p
        n = m
    m = (p + n) / 2
    print(i+1, m)