#include <iostream>
using namespace std;
int main()
{
	int n, a, b, c;	cin >> n;
	a = n / 100;
	b = (n - 100 * a) / 10;
	c = n - 100 * a - 10 * b;
	if (a + c == b)	cout << "Yes";
	else	cout << "No";
}