题解 | #进制转换#

'''
解题思路：
dec = int('0xFF',base=16)
'''

while 1:
    try:
        print(int(input(),base=16))
    except:
        break

'''
while 1:
    try:

        s = input()

        D = {'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}
        #print(D)

        j = 0
        t = 0
        for i in range(len(s)-1,1,-1):
            #print(s[i])
            t += D[s[i]]*(16**j)
            j += 1
        print(t)

    except:
        break        
'''