#include <bits/stdc++.h>
using namespace std;

int main() {
	int N;
	cin >> N;
	
	int a = N / 100;
	int b = N / 10 % 10;
	int c = N % 10;
	
	if (a + c == b) {
		cout << "Yes" << endl;
	}
	else {
		cout << "No" << endl;
	}
}