#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>

int comp(const void *a, const void *b);

int main ()
{
    int year;
    int a[4];
    memset(a, 0, sizeof(a));
    scanf("%d", &year);
    bool flag=false;
    int temp;
    int i;
    while(!flag)
    {
        temp=++year;
        //printf("yrar=%d\n", year);
        //printf("-------------------------------------------------------------------------\n");
        //++cnt;
        for(i=0;i<4; ++i)
        {
            a[i]=temp%10;
            temp/=10;
        }
        /*for(i=3; i>=0; --i)
            printf("%d ", a[i]);
        printf("\n");
        printf("-------------------------------------------------------------------------\n");*/
        qsort(a, 4, sizeof(a[0]), comp);
        /*for(i=0; i<4; ++i)
            printf("%d ", a[i]);
        printf("\n");
        printf("-------------------------------------------------------------------------\n");*/
        for(i=0;i<3;++i)
        {
            if(a[i]<a[i+1])
                ;
                //printf("%d<%d;", a[i], a[i+1]);
            else
                break;
            /*{
                printf("\n");
                printf("%d=%d.", a[i], a[i+1]);
                printf("\n");
                break;
            }*/
        }
        //printf("-------------------------------------------------------------------------\n");
        //printf("i=%d.", i);
        //printf("-------------------------------------------------------------------------\n");
        if(i==3)
            flag=true;
    }
    if(flag)
        printf("%d\n", year);
    return 0;
}

int comp(const void*a, const void *b)
{
    return *(int*)a-*(int*)b;
}