cmmnr

#include <iostream>
using namespace std;

int main()
{
    long long m,n,p=1,nmax=0;
    cin>>n;
    while(p<=n)
    {
        m=n/p/10*p+n%p;
        if(m>nmax)
            nmax=m;
        p*=10;
    }
    cout<<nmax;
    return 0;
}