include <bits/stdc++.h>

using namespace std; int h=[100005]; int main() { int n; cin>>n; for(int i=1;i<=n;i++){

cin>>h[i];

}int l=1,r=n; int ans=; while(l<r){ int x=r-l; }int y=min(h[i],h[r]){ ans=max(ans,x*y); if(h[l]>h[r]){

	r--;
	else
	l++;
}

}cout<<ans; return 0; }