#include<bits/stdc++.h>

using namespace std;
using ll = long long;
using pint = pair<ll,ll>;
// #include"debug.hpp"

bool f(ll x, ll y, ll N) {
	if(__gcd(x, y) != 1) return false;
	if(y * 2 <= N)return true;
	ll pos = N - y;
	// print(pos);
	
	if(pos + 1 >= x) {
		return true;
	}
	
	return false;
}

int main()
{
	ll N; cin >> N;
	ll x, y; cin >> x >> y;
	if(x > y)swap(x, y);
	if(f(x, y, N)) {
		cout << "YES" << endl;
	} else {
		cout << "NO" << endl;
	}
}