def adda(a, b, c=0, d=0, e=0):
    """Add number b to number a. Optionally also add 
    any of numbers c, d, e to the result.
    """
    print(f"Function `adda` called with arguments a={a} b={b}", end="")
    if c: print(f" c={c}", end="")
    if d: print(f" d={d}", end="")
    if e: print(f" e={e}", end="")
    print()
    return a + b + c + d + e