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#include <iostream>
using namespace std;
int main () {
    int a,y, x1, x2, x3, x4 ;
    cin >> a;
    do{
       x1=a%10;       //ïîñëåäíÿÿ öèôðà;
       x2=a/10%10;    //ïðåäïîñëåäíÿÿ öèôðà;
       x3=a/100%10;   //âòîðàÿ öèôðà;
       x4=a/1000;     //ïåðâàÿ öèôðà;
    }
    while( x1 != x2 && x1 != x3 && x1 != x4 && x2 != x3 && x2 != x4 && x3 != x4 );  
    a++;
    cout << a;                        
}                   
                             
                         
                         

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