def deal_binary(bits):
    size = len(bits)
    arr = []
    dec = 0
    for i in bits:
        arr.append(i)
    m = 1
    for i in range(len(bits)):
        if int(arr[(size-1)-i]) == 1:
            dec += m
        #print("bit index %s = %s and has value of %s exponant is %s" %((size-1)-i, int(arr[(size-1)-i]), dec, m))
        m = m*2
    print dec