#include<stdio.h>
int ispalindrome(int n)
{
    int reversed =0,original=n,digits;
    while(n>0){
        digits=n%10;
        reversed = reversed*10+digits;
        n/=10;
        
    }
    return(reversed == original);
    
}
int main(){
    float tempInput;
    int input;
    if (scanf("%f",&tempInput)!=1){
        printf("Invalid input");
        retuirn 0
        
    }
    int next=input+1;
    while(!ispalindrome(next))
    {
        next++;
        
    }
    printf("%d",next);
    return 0;
    
}