#include<iostream>
#include<fstream>
#include<cstring>
#define DX 20080
using namespace std;
fstream fin("p1.in",ios::in);
char s[DX];
int main()
{
    int a,n,i,j,nr=0;
    cin>>s;
    n=strlen(s);
    for(i=0;i<n;i+=8)
    {
        a=0;
        if(s[i]=='1') a=1;
        if(a==1)
        {
            if(nr!=0)
            {
                cout<<"NO\n";
                return 0;
            }
            nr=0;
            for(j=i+7;j>i && s[j]=='0' ;j--) nr++;
        }
        else
        {
            nr--;
        }
    }
    if(nr!=0)
    {
        cout<<"NO\n";
        return 0;
    }
    cout<<"YES\n";
    return 0;
}