#include <fstream>

using namespace std;

ifstream inFile("ssm.in");
ofstream outFile("ssm.out");

int main(){
	int N, x;
	inFile >> N;

	int scrt = 0, smax = 0;

	for(int i = 1; i <= N; i++) {
		inFile >> x;
		scrt += x;
		if(scrt < 0) { scrt = 0; }
		if(smax < scrt) { smax = scrt; }
	}

	outFile << smax;
}