import math
string = "AAAFU"
number = 0
a = -1
letlist = ('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z')
for i in letlist:
    a += 1
    if string[0] == i:
        number += math.pow(26,4) * a
        break
a = -1
for i in letlist:
    a += 1
    if string[1] == i:
        number += math.pow(26,3) * a
        break
a = -1
for i in letlist:
    a += 1
    if string[2] == i:
        number += math.pow(26,2) * a
        break
a = -1
for i in letlist:
    a += 1
    if string[3] == i:
        number += 26 * a
        break
a = -1
for i in letlist:
    a += 1
    if string[4] == i:
        number += a
        break
print number