a=int(input())
b=int(input())
c=int(input())
if a%c==0:
    if a%b==0:
        if a*2//(3*b)>=a//c:
            print("YES")
        else:
            print("NO")
    else:
        if (a//b+1)*2/3>=a//c:
            print("YES")
        else:
            print("NO")
else:
    if a%b==0:
        if a//b*2/3>=a//c+1:
            print("YES")
        else:
            print("NO")
    else:
        if (a//b+1)*2/3>=a//c+1:
            print("YES")
        else:
            print("NO")