#yuki634
import sys

n=int(raw_input())
l=[]
i=1
while True:
 x=i*(i+1)/2
 if x<n:
  l.append(x)
 elif x==n:
  print 1
  sys.exit()
 else:
  break
 i+=1

s=set(l)
for y in l:
 if n-y in s:
  print 2
  sys.exit()

print 3