//Codeforces Round #166 (Div. 2) A Beautiful Year
import java.io.*;
import java.math.*;
import java.text.*;
import java.util.*;
//Codeforces
public class MainCodeforces1 {
private static MyScanner in;
private static PrintStream out;
public static void main(String[] args) throws IOException {
// helpers for input/output
boolean LOCAL_TEST = false;// change to false before submitting
out = System.out;
if (LOCAL_TEST) {
in = new MyScanner("E:\\zin2.txt");
}
else {
boolean usingFileForIO = false;
if (usingFileForIO) {
// using input.txt and output.txt as I/O
in = new MyScanner("input.txt");
out = new PrintStream("output.txt");
}
else {
in = new MyScanner();
out = System.out;
}
}
solve();
}
private static void solve() throws IOException
{
int y = in.nextInt();
int yy = y + 1;
HashSet<Character> hs = new HashSet<Character>();
while (true) {
boolean distinct = true;
hs.clear();
char[] cc = String.valueOf(yy).toCharArray();
for (char c : cc) {
if (hs.contains(c)) {
distinct = false;
break;
}
else {
hs.add(c);
}
}
if (distinct)
break;
yy++;
}
out.println(yy);
}
static long compare(long a1, long b1, long a2, long b2) {
// compare a1/b1 with a2/b2
return (a1 * b2) - (a2 * b1);
}
// =====================================
static class MyScanner {
Scanner inp = null;
public MyScanner() throws IOException
{
inp = new Scanner(System.in);
}
public MyScanner(String inputFile) throws IOException {
inp = new Scanner(new FileInputStream(inputFile));
}
public int nextInt() throws IOException {
return inp.nextInt();
}
public long nextLong() throws IOException {
return inp.nextLong();
}
public double nextDouble() throws IOException {
return inp.nextDouble();
}
public String nextString() throws IOException {
return inp.next();
}
}
}
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