#include<bits/stdc++.h>
 
using namespace std;
 
int main()
{
    int n, k, t;
    cin >> n >> k >> t;
    int res = n*3 + min(k-1, n-k);
    if (res <= t)
        cout << "YES" << endl;
    else
        cout << "NO" << endl;
 
    return 0;
}