import math


def modified_sigmoid(x: float, coefficient: float, shift: float) -> float:
    """
    return as single value of a modified sigmoid function, which correpsonds to an
    argument x.
    :param x: argument to the sigmoid function
    :param coefficient: a scaling coefficient
    :param shift: a shifting term
    :return: a value of a modified sigmoid function
    """
    return 1/(1+math.exp(-coefficient*(x-shift)))