Untitled

#include <iostream>
using namespace std;
int main()
{
	int a, b, c, d, e, f, g;
	cin >> a;
	b = a / 100000;
	c = a / 10000 % 10;
	d = a / 1000 % 10;
	e = a / 100 % 10;
	f = a / 10 % 10;
	g = a % 10;
	if (b + c + d == e + f + g) cout << "YES";
	else  cout << "NO";
}