/* -*- coding: utf-8 -*-
 *
 * 3481.cc:  No.3481 495 - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  int n;
  scanf("%d", &n);

  int a = n / 100, b = (n / 10) % 10, c = n % 10;

  if (a + c == b) puts("Yes");
  else puts("No");
  
  return 0;
}