#include<iostream>
#include<algorithm>
#include<cstdio>
using namespace std;
int n;
long long a[200000],sum[200000],ans;
int main(){
	scanf("%d",&n);
	for(int i=1;i<=n;++i){
		scanf("%lld",a+i);
		sum[i]=sum[i-1]+a[i];
	}
	for(int i=1;i<=n;++i){
		long long x,y;
		x=i-1;y=i+1;
		while(a[x]>a[i]) x--;
		while(a[y]>a[i]) y++;
		ans=max(ans,a[i]*(sum[y-1]-sum[x]));
	}
	printf("%lld",ans);
	return 0;
}