#include <iostream>

using namespace std;
long long n,a,b,c,d;
int main()
{
    cin>>n;
    a=n/1000;
    b=n/100%10;
    c=n/10%10;
    d=n%10;
    if ((a==b && b==c ) || (a==b && b==d) || (a==c && c==d) || (b==c && c==d))cout << "YES" << endl;
    else cout << "NO" << endl;
    return 0;
}