#include <bits/stdc++.h>
using namespace std;
ifstream file("input.txt");
using namespace std;
void maker(int x);
int main() {
  int y;
  cin >> y;
  maker(y + 1);
}
void maker(int x) {
  int a, b, c, d;
  a = (x / 1000) % 10;
  b = (x / 100) % 10;
  c = (x / 10) % 10;
  d = (x / 1) % 10;
  while (a == b || a == c || a == d || b == c || b == d || c == d) {
    x++;
    a = (x / 1000) % 10;
    b = (x / 100) % 10;
    c = (x / 10) % 10;
    d = (x / 1) % 10;
  }
  cout << (a * 1000 + b * 100 + c * 10 + d);
}
