s='1'+'2'*177
while ('12' in s) or ('3322' in s) or ('2222' in s):
    if ('12' in s):
        s=s.replace ('12','33',1)
    if ('2222' in s):
        s=s.replace ('2222','1',1)
    if ('3322' in s):
        s = s.replace('3322', '21',1)
sum = 0        
for i in s:
    sum += int(i)
print(sum)