import sequtils
template times*(n:int,body) = (for _ in 0..<n: body)
template `max=`*(x,y) = x = max(x,y)
template `min=`*(x,y) = x = min(x,y)

proc getchar_unlocked():char {. importc:"getchar_unlocked",header: "<stdio.h>" .}
proc scan(): int =
  while true:
    let k = getchar_unlocked()
    if k < '0': break
    result = 10 * result + k.ord - '0'.ord

let n = scan()
var C = newSeq[int]()
for i in 1..n:
  let c = i * (i + 1) div 2
  if c > n : break
  C &= c
for i in 0..<C.len:
  if n == C[i] : quit "1",0
for i in 0..<C.len:
  for j in i..<C.len:
    if n == C[i] + C[j]: quit "2",0
echo 3