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

class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb=new StringBuilder();

        int N=300000,i,j,ans[]=new int[N+1];
        ArrayList<Integer> fac[]=new ArrayList[N+1];
        for(i=0;i<=N;i++)
        {
            fac[i]=new ArrayList<>();
            ans[i]=i;
        }
        for(i=2;i<=N;i++)
        for(j=2*i;j<=N;j+=i) fac[j].add(i);

        ans[1]=0;
        for(i=2;i<=N;i++)
        for(int x:fac[i]) ans[i]=Math.min(ans[i],ans[x]+i/x);

        int n=Integer.parseInt(bu.readLine());
        System.out.println(ans[n]);
    }
}