#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll,ll> P;
#define REP(i,n) for(ll i=0;i<ll(n);i++)
















int main(void){
	cin.tie(nullptr);  ios_base::sync_with_stdio(false);
	ll i,j;




	string n;
	cin >> n;

	if(n[1]-'0'==n[0]-'0'+n[2]-'0') cout << "Yes" << endl;
	else cout << "No" << endl;










	return 0;

}