import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Scanner;
import java.util.Set;
class Main {
public static void main
(String[] args
) { Scanner sc
= new Scanner
(System.
in);
long freq = 0;
Set<Long> set = new HashSet<Long>();
List<Integer> l = new ArrayList<Integer>();
while (sc.hasNextLine()) {
int n
= Integer.
parseInt(sc.
nextLine()); l.add(n);
}
int i = 0;
while (true) {
if (set.contains(freq)) break;
set.add(freq);
freq += l.get(i);
i = (i+1) % l.size();
}
sc.close();
}
}
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