import math


def f(x):
    if x > -5 and x != 0:
        return 1/x
    elif x > -10:
        return x*x
    else:
        return math.sqrt(abs(x) + 1)


def main():
    x = int(input('Введите X:'))
    print(f(x))


if __name__ == '__main__':
    main()