#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int cate,n,ras;
char s[1004];
int main()
{
    //freopen("input","r",stdin);
   // freopen("output","w",stdout);
    gets(s+1);
    n=strlen(s+1);
    ras=1;
    for(int i=1;i<=n;i++)
    {
        if(s[i]=='1')
        {
            if(cate>0){ras=0;break;}
            for(int j=2;j<=8;j++)
            {
                i++;
                if(s[i]=='0')cate++;
                else cate=0;
            }
        }
        else if(s[i]=='0')
        {
            cate--;
            i+=7;
        }
    }
    if(ras==0)printf("NO");
    else printf("YES");
    return 0;
}