#include<bits/stdc++.h>
using namespace std;
#define int long long
signed main()
{
	string s;cin>>s;
	for(int i=1;i<s.size();i+=2)
	{
		if(s[i]!='0')
		{
			cout<<"No";
			return 0;
		}
	}
	cout<<"Yes";
	return 0;
}