#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>

//#include<bits/stdc++.h>


using namespace std;


int main() {
	
	long a, b, c;
	cin >> a >> b >> c;
	if (a > b)swap(a, b);
	if ((a % 2 == 0&&b%2&&b>1) || (a%2&&a>1&&b % 2 == 0))cout << "YES" << endl;
	else if(a*2==b)cout << "YES" << endl;
	else if (a == b&&a == 1)cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;


}