#include <bits/stdc++.h>
#define int long long
#define endl "\n"
using namespace std;

void solve()
{
    int n;cin>>n;
    int a = n%10;
    n/=10;
    int b = n%10;
    n/=10;
    int c = n;

    if (a+c==b) cout <<"Yes" << endl;
    else cout << "No" << endl;
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    solve();
}