#include <stdio.h>
#include <stdlib.h>

int main()

{
 FILE *f = fopen("ssm.in","r");
 int n;
 int v[6000000];
 
 fscanf(f, "%i", &n);
 
 int sum, elem;
 int i;fscanf(f, "i", &elem);
 sum = elem;
 for (i = 1; i < n; i++)
 {fscanf(f, "i", &elem);
     if (sum + elem < elem)
        sum = elem;
     else
         sum +=elem;
      
 }    
 fclose(f);
 
 f = fopen("ssm.out","w");
 
 fprintf(f, "%i", sum);
 fclose(f);
 return 0;
}