#include <stdio.h>

int main(int argc, char **argv) {
	int maxsofar = 0;
	int maxendinghere = 0;
	int x;
	while (scanf("%d", &x) == 1) {
		maxendinghere += x;
		if (maxendinghere < 0) maxendinghere = 0;
		if (maxendinghere > maxsofar) maxsofar = maxendinghere;
	}
	printf("%d\n", maxsofar);
}