fin = open("baza.in", 'r')
fout = open("baza.out", 'w')

s = fin.readline()

c = 0
for i in xrange(len(s), 0, -1):
  c += (ord(s[i-1]) - ord('a')) * (26 ** (len(s)-i))

fout.write(str(c))
fin.close()
fout.close()