#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
using namespace std;
int main()
{
int year;
int a,b,c,d;
cin >> year;
while(1){
year++;
a=year/1000;
b=year/100;
b=b%10;
c=year/10;
c=c%10;
d=year%10;
if(a!=b && a!=c && a!=d && b!=c && b!=d && c!=d)
break;
}
cout<< year << endl;
return 0;
}
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