#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a,b,c,h;
	cin>>n;
	a=n%10;
	b=n/10%10;
	c=n/100;
	if(a<b)swap(a,b);
	if(a<c)swap(a,c);
	if(b<c)swap(b,c);
	h=a*100+b*10+c*1;
	cout<<h;
	return 0;
}

/**************************************************************
	Problem: 1042
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/