def expression_matter(a, b, c):

    # ensuring we have the right input // error handling
    if not isinstance(a, int) or not isinstance(b, int) or not isinstance(c,int):
        raise TypeError("sorry, only intergers allowed - try again")
    if not a >= 1 or not a <= 10:
        raise ValueError("sorry, a needs to be between 1 and 10")
    if not b >= 1 or not b <= 10:
        raise ValueError("sorry, b needs to be between 1 and 10")
    if not c >= 1 or not c <= 10:
        raise ValueError("sorry, c needs to be between 1 and 10")

    #list of possible calculations
    calc1 = a * (b + c)
    calc2  = a * b * c
    calc3 = a + b * c
    calc4 = (a + b) * c
    calc5 = a + b + c

    # highest achievable result
    return max(calc1,calc2,calc3,calc4,calc5)