""" 最简单方法 ins = int(input(),16) print(ins) """ ins = input()[2:] dic = {'A':10,'B':11,'C':12,'D':13,'E':14,'F':15} out = 0 n = len(ins) for i in range(len(ins)): if ins[i] in dic: out += dic[ins[i]]*16**(n - i - 1) else: out += int(ins[i])*16**(n - i - 1) print(out)
