a = input()
b = [1,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,4,1,2,3,1,2,3,4]    #空格 和 26个字母打表需要按几次
cnt = 0
for i in a:
    if i == ' ':
        cnt += b[0]
    else:
        c = ord(i)-96
        cnt += b[c]
print(cnt)