#include <bits/stdc++.h>
#include <iostream>
#include <cmath>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    int N;
    cin >> N;
    int A = N / 100;
    int B = N / 10 % 10;
    int C = N % 10;
    if (A + C == B) {
        cout << "Yes";
    }
    else {
        cout << "No";
    }
}