Codeforces_271A

//Codeforces Round 271A
#include <string>
#include <cstring>
#include <iostream>
using namespace std;
int main()
{
    int n;
    char mass[4];
    cin >> n;
    for(int i=0;i<10000;i++)
    {
        n++;
        string s = to_string(n);
        strcpy(mass, s.c_str());
        if(mass[0]!=mass[1] && mass[0]!=mass[2] && mass[0]!=mass[3] && mass[1]!=mass[2] && mass[1]!=mass[3] && mass[2]!=mass[3])
        {
            cout << mass;
            break;
        }
    }
    return 0;
}