#include <stdio.h>
int main() {
    int num, temp, rev;
    if (scanf("%d", &num) != 1 || num < 0 || num > 1000)
    {
        printf("Invalid input\n");
        return 0;
    }
    num++;
    while (1) 
    {
        temp = num;
        rev = 0;
        while (temp > 0) 
        {
            rev = rev * 10 + temp % 10;
            temp = temp / 10;
        }
        if (rev == num) 
        {
            printf("%d\n", num)
            break;
        }
         num++;
    }
    return 0;
}