#include <iostream>
using namespace std;

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" << endl;
    } else {
        cout << "No" << endl;
    }

    return 0;
}