#include <iostream>

using namespace std;

int main()
{
   int N;

   cin >> N;

   int a;

   a = N%10;

   int b;

   b = (N/10)%10;

   int c;

   c = N/100;

   int M;

   M = a*100 + b*10 + c*1;

   if(M>N) {
    cout << M <<endl;
   }
   else {
    cout << N <<endl;
   }


    return 0;
}