#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
#define ALL(A) A.begin(), A.end()

using namespace std;

typedef long long ll;
typedef pair<int, int> P;

int main()
{
	srand(time(NULL));
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int N, M, X; cin >> N >> M >> X;
	vector<bool> ok(X, false);
	rep (i, X){
		int R = rand() % N;
		if (R >= N - M) ok[i] = true;
	} // end rep

	cout << (count(ALL(ok), true) >= 3 ? "YES" : "NO") << endl;
 
	return 0;
}