def N_inc(q, n):
    """
    function to find Number of incident particle

    Arguments
    ---------
    q: value of current digityzer in units of 1.0E-10[C]
    n: charge of incident particle in units of e

    Return
    ------
    Ni : Number of incident particle
    """
    e = 1.602176634E-19  # elementary charge [C]
    return q * 1.0E-10 / (n * e)