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#include <iostream>
#include "maklib.h"
#include "message.h"

using namespace std;


int main() {
  if(MyNodeId() == 0) {
    long sum = 0;

    long max = 0;
    int cnt = Size();
    int i;

    for(i=1; i<=cnt; i++){
      sum+=ElementAt(i);
      if(sum>max) max = sum;
      if(sum<0) sum = 0;
    }

    cout << max;
  }
}