#include <iostream>

using namespace std;

int main()
{
    int M, N, K, num = 0;

    cin >> M >> N >> K;

    if (N == 1)
    {
        cout << "YES" << endl;
    }
    else
    {
        num += M;
        while (M >= N)
        {
            num += M / N;
            M = M % N + M / N;
        }
        if (num >= K)
            cout << "YES" << endl;
        else
            cout << "NO" << endl;
    }
}