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from math import *

def f(n) :
    return (n+1)*exp(n)+0.5*n

a = -1
b = 0
x = -2
epsilon = float(input("epsilon="))

while (a-x) > epsilon:
    acc = (a-b) / (f(a)-f(b))
    x = a
    a = a - acc * f(a)
print(a)