import java.util.*;
import java.io.*;
import java.math.*;
// import java.util.stream.Stream;

class Main{
    static BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
    static StringTokenizer st;
    static PrintWriter output = new PrintWriter(System.out);
    static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws IOException{
        long n = sc.nextLong();
        Map<Long,Integer> m = prime_factorization(n);
        long ans = 0;
        for(long val : m.keySet()) ans += val*m.get(val);
        output.print(ans);
        output.flush();
    }
    static Map<Long,Integer> prime_factorization(long val) {
        Map<Long,Integer> map = new HashMap<>();
        for(long i=2; i*i<=val;i++) {
            int count = 0;
            while(val % i == 0) {
                val /= i;
                count++;
            }
            if(count > 0)map.put(i,count);
        }
        if(val != 1L) map.put(val,1);
        return map;
    }
}