#include <iostream>
using namespace std;
int main() {
int y;
cin>>y;
for(int i=y+1; i<=9999; i++){
int a=i/1000;
int b=(i/100)%10;
int c=(i/10)%10;
int d=i%10;
if(a!=b and a!=c and a!=d and b!=c and b!=d and c!=d) {
cout<<a*1000+b*100+c*10+d<<endl;
break;
}
}
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CglpbnQgeTsKCWNpbj4+eTsKCWZvcihpbnQgaT15KzE7IGk8PTk5OTk7IGkrKyl7CgkJaW50IGE9aS8xMDAwOwoJCWludCBiPShpLzEwMCklMTA7CgkJaW50IGM9KGkvMTApJTEwOwoJCWludCBkPWklMTA7CgkJaWYoYSE9YiBhbmQgYSE9YyBhbmQgYSE9ZCBhbmQgYiE9YyBhbmQgYiE9ZCBhbmQgYyE9ZCkgewoJCWNvdXQ8PGEqMTAwMCtiKjEwMCtjKjEwK2Q8PGVuZGw7CgkJYnJlYWs7IAoJCX0KCX0KCXJldHVybiAwOwp9