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

using i32 = int;
using i64 = long long;
using i128 = __int128_t;
using f64 = double;
using p2 = pair<i64, i64>;
using p3 = tuple<i64, i64, i64>;

void _main();
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(18);
  _main();
}

void _main() {
  i64 n;
  cin >> n;
  i64 a = n / 100;
  i64 b = n / 10 % 10;
  i64 c = n % 10;
  if (a + c == b) {
    cout << "Yes\n";
  } else {
    cout << "No\n";
  }
}