题解 | #进制转换#

import sys
dic={'0':0,'1':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,'8':8,'9':9,'A':10,'B':11,'C':12,'D':13,'E':14,'F':15}
for line in sys.stdin:
    a = list(line.split()[0][2:])
    num = 0
    a.reverse()
    for i in range(len(a)):
            num += dic[a[i]]*(16**(i))
print(num)