#include <iostream>

int main()
{
    int a,b,c;
    std::cin >> a >> b >> c;
    
    int d = a/b;
    if(a%b != 0)
    {
        d++;
    }
    d -= a/c;
    if(a%c != 0)
    {
        d--;
    }
    if(d >= 0)
    {
        std::cout << "YES" << std::endl;
    }
    else
    {
        std::cout << "NO" << std::endl;
    }
    
    return 0;
}