#include<bits/stdc++.h>
using namespace std;

set<int>s;

bool is(int x){

    s.clear();

    for(int i=0;i<4;i++){
        int b = x%10;
        //cout<<b<<" ";
        s.insert(b);
        x=x/10;
    }

    //cout<<s.size()<<"\n";

    if(s.size()==4) return true;
    return false;

}

int main(){



    int b;
    cin>>b;

    for(int i=b+1;i<=9000;i++){
        if(is(i)){
            cout<<i;
            //cout<<"here\n";
            break;
        }
    }


    return 0;

}