#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef string str;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    ll s;
    cin >> s;
    ll a = s / 10 / 10, b = s / 10 % 10, c = s % 10;
    if (a + c == b) cout << "Yes\n";
    else cout << "No";
    return 0;
}