#include<bits/stdc++.h>
using namespace std;
template<typename key,typename value>
class map_sort_with_value{
	private:
		unordered_map<key,value>mp;
		vector<pair<key,value>>vct;
	public:
		bool cmp(pair<key,value> vala,pair<key,value> valb){return vala.second>valb.second;}
		value &operator()(int __val){
			vct.clear();
			for(auto i:mp){
				vct.push_back(i);
			}
			sort(vct.begin(),vct.end(),cmp);
			return &mp[vct[__val].first];
		}
		value &operator[](const key __val){
			return &mp[__val];
		}
		long long size(){
			return mp.size();
		}
};
int main(){
	map_sort_with_value<int,int>mp;
	mp[1]=1;
	mp[0]=2;
	for(int i=0;i<mp.size();i++) cout<<mp(i);
	return 0;
}