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#include <iostream>
#include <vector>
using namespace std;
long long jegop(long long a, long long b){
if( b ==0) return 1;
long long i,c;
c=a;
for( i = 0 ; i < b - 1 ; i++ ){
c = c * a;
}
return c;
}
void make_vector(vector<long long>& vec,long long num){
long long i=1;
long long digit;
// cout << "begin i : " << i <<" and " << num <<endl;
// cout <<" vector.size() : " << vec.size() <<endl;
long long tempNum= num;
while(true){
if( tempNum <= jegop(10,i)){
// cout << "breaking..."<<endl;
break;
}
else {
// cout << tempNum << " and " << jegop(10,i) << endl;
i++;
}
}
while(true){
if (num ==0 ) break;
//cout << " i...." << i <<endl;
if( num >= jegop(10,i-1)){
digit = num / jegop(10,i-1);
//cout << "push backing..." << digit <<endl;
vec.push_back(digit);
num = num - (digit * jegop(10,i-1));
i--;
}else{
// cout << "pushing back 0..."<<endl;
vec.push_back(0);
i--;
}
}
}
void print(vector<long long>& vec){
for(long long i=0; i < vec.size(); i++){
cout << vec[i];
}
cout <<endl;
}
bool find_zero_inVector(vector<long long>& vec){
for(long long i=0 ; i < vec.size(); i++){
if( vec[i] == 0 ) return true;
}
return false;
}
void increment_pair(vector<long long>& vec,long long a, long long b){
vec[a] = vec[a]+1;
vec[b] = vec[b]+1;
}
bool check_All_nine(vector<long long>& vec){
for(long long i=0 ; i < vec.size() ; i++){
if( vec[i] != 9) return false;
}
return true;
}
void clean(vector<long long>& vec){
while( vec.size() !=0){
vec.pop_back();
}
}
void change_four_digit(vector<long long>& vec,long long temp){
//cout << "temp->" << temp <<endl;
for(long long i=0 ; i < temp ; i++){
if( i==0 || i== temp-1) vec.push_back(1);
else vec.push_back(0);
}
}
long long vec_to_long(vector<long long>& vec){
long long temp = vec.size();
long long result=0;
for(long long i=0 ; i < vec.size() ; i++){
result += vec[i] * jegop(10,temp-1);
temp--;
}
return result;
}
long long generate_nextPalindrome(vector<long long>& vec){
//prlong long(vec);
long long mid = vec.size()/2;
//cout << "vec_size->" << vec.size() <<endl;
if( vec.size()%2 ==1){// if palindrome is odd digits
//cout << "one...."<<endl;
long long begin = 0;
long long end = vec.size()-1;
while( true ){
if(( vec[begin] != vec[end] || begin==end)){
// cout <<vec[begin] << " AND " << vec[end] <<endl;
if( vec[begin] <9) {
// cout <<" two..."<<endl;
//cout << "vec[begin] : " << vec[begin] <<endl;
vec[begin] = vec[begin] +1;
}
else if( vec[begin]>=9){
// cout <<" one..."<<endl;
if( check_All_nine(vec)==false){
// cout << "begin " << begin <<endl;
vec[begin] =0;
begin--;
end++;
while( true){
if(vec[begin] !=9 && vec[end] !=9) {
//cout <<"fuking..."<<endl;
increment_pair(vec, begin, end);
break;
}
else{
vec[begin] =0;
vec[end] =0;
}
begin--;
end++;
}
}else{
long long temp = vec.size();
clean(vec);
change_four_digit(vec,temp+1);
}
}
break;
}else if(vec[begin] == vec[end] && begin != end){
//cout << begin << " and " << end <<endl;
begin++;
end--;
}
}
}else if(vec.size()%2 ==0) {// if palindrom is even number
//cout <<" two...." <<endl;
long long begin = 0;
long long end = vec.size()-1;
while( true ){
// cout << "begin origin: " << begin <<" end origin : "<< end <<endl;
if( begin+1 == end){
//cout << "begin : " << begin <<" end : "<< end <<endl;
if( vec[begin] !=9 ){
//cout << "dkfjslkj..."<<endl;
increment_pair(vec,begin,end);
}else if( vec[begin] ==9 && begin!=0 && check_All_nine(vec)==false){
// cout <<"doing...."<<endl;
while( true){
if(vec[begin] !=9 && vec[end] !=9){
//cout << begin << " and " << end <<endl;
increment_pair(vec,begin,end);
break;
}
else{
vec[begin] =0;
vec[end] =0;
}
begin--;
end++;
}
}else if( check_All_nine(vec)== true){
//cout <<"here..."<<endl;
long long temp = vec.size();
clean(vec);
change_four_digit(vec,temp+1);
}
break;
}
begin++;
end--;
}
}
// cout <<"Next palindrom :";
//print(vec);
//cout << " vec_to_long long : "<< vec_to_long long(vec)<<endl;
long long re = vec_to_long(vec);
return re;
}
int main (int argc, const char * argv[])
{ // cout <<"......... "<< jegop(10,9) <<" and " << jegop(10,10) << endl;
long long num=0;
long long result=0;
/*
while(true){
cin>>num;
clean(vec);
make_vector(vec,num);
cout << "vector size: " << vec.size() <<endl;
generate_nextPalindrome(vec);
}
*/
while(true){
vector<long long> vec;
cin >> num;
if( num ==0) return 0;
result =0;
//clean(vec);
make_vector(vec,1);
if( num != 1 && num <=1000000){
for(long long i=1 ; i < num ; i++){
result = generate_nextPalindrome(vec);
//cout << "result ::" << result <<endl;
clean(vec);
make_vector(vec,result);
}
cout << result <<endl;
}
else if( num==1) {
cout << 1 <<endl;
}
}
}
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