import java.io.*;
import java.util.*;


class Main {
    static final int I=1<<27;
    public static void main(String[] args) {
        MyScanner sc = new MyScanner();
        out = new PrintWriter(new BufferedOutputStream(System.out));
        int n=sc.nextInt();
        final int W=10000000;
        int[]dp=new int[W];
        Arrays.fill(dp,I);
        dp[0]=0;
        final int B=5000;
        int[]t=new int[B];
        Set<Integer> ts=new HashSet<Integer>();
        for(int i=1;i<5000;++i){
            int w=i*(i+1)/2;
            t[i]=w;
            ts.add(w);
            if(t[i]==n){
                out.println(1);
                out.close();
                return;
            }
        }
        for(int i=0;i<B;++i){
            int rest=n-t[i];
            if(rest<=0){
                continue;
            }
            if(ts.contains(rest)){
                out.println(2);
                out.close();
                return;
            }
        }
        out.println(3);
        out.close();
    }
    // http://codeforces.com/blog/entry/7018
    //-----------PrintWriter for faster output---------------------------------
    public static PrintWriter out;
    //-----------MyScanner class for faster input----------
    public static class MyScanner {
        BufferedReader br;
        StringTokenizer st;
        public MyScanner() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }
        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
        int nextInt() {
            return Integer.parseInt(next());
        }
        long nextLong() {
            return Long.parseLong(next());
        }
        double nextDouble() {
            return Double.parseDouble(next());
        }
        String nextLine(){
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
        int[] nextIntArray(int n){
            int[]r=new int[n];
            for(int i=0;i<n;++i)r[i]=nextInt();
            return r;
        }
    }
}