#include<stdio.h>
#define dim 6000010
int i,j,k,s[dim],v[dim],n,maxi;
int main()
{
	freopen("ssm.in","r",stdin);
	freopen("ssm.out","w",stdout);
	scanf("%d",&n);
	for(i=1;i<=n;i++)
		scanf("%d",&v[i]);
	s[1]=v[1];
	for(i=2;i<=n;i++)
	{
		if(v[i]>s[i-1]+v[i])
			s[i]=v[i];
		else
			s[i]=s[i-1]+v[i];
		if(s[i]>maxi)
			maxi=s[i];
	}
	printf("%d",maxi);
	return 0;
}