In this paper we consider the following nonlinear critical problem: $-Δ u= (1+\varepsilon_0 K_0(x)) u^\frac{n+2}{n-2}$ , $u>0$ in $Ω$ , $u=0$ , on $\partial Ω$ , where $Ω$ is a bounded domain of $\mathbb{R}^n$ , $K_0$ is a given function and $\varepsilon_0$ is a small parameter. Under the assumption that $K_0$ is flat near its critical points, we prove an existence result in terms of the Euler-Hopf index. We believe that it is the very first result in this direction that we do not need any restrictions on the flatness coefficient.
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