// Codeforces Round #156 (Div. 2): A - Greg's Workout
import java.io.*;
import java.math.*;
import java.util.*;
public class MainCodeforces1 {
private static MyScanner in;
private static PrintStream out;
public static void main(String[] args) throws IOException {
// helpers for input/output
boolean LOCAL_TEST = false;
// LOCAL_TEST = true;// comment it before submitting
out = System.out;
if (LOCAL_TEST) {
in = new MyScanner("E:\\zin2.txt");
}
else {
boolean usingFileForIO = false;
if (usingFileForIO) {
// using input.txt and output.txt as I/O
in = new MyScanner("input.txt");
out = new PrintStream("output.txt");
}
else {
in = new MyScanner();
out = System.out;
}
}
solve();
}
private static void solve() throws IOException
{
int N = in.nextInt();
int[] sum = new int[3];
sum[0] = sum[1] = sum[2] = 0;
for (int i = 0; i < N; i++) {
int a = in.nextInt();
sum[i % 3] += a;
}
int max = Math.max(sum[0], Math.max(sum[1], sum[2]));
if (max == sum[0])
out.println("chest");
else if (max == sum[1])
out.println("biceps");
else
out.println("back");
}
static class MyScanner {
StreamTokenizer in;
public MyScanner() throws IOException
{
Reader r = new BufferedReader(new InputStreamReader(System.in));
in = new StreamTokenizer(r);
}
public MyScanner(String inputFile) throws IOException {
Reader r;
r = new BufferedReader(new FileReader(inputFile));
in = new StreamTokenizer(r);
}
public int nextInt() throws IOException {
in.nextToken();
return (int) in.nval;
}
public long nextLong() throws IOException {
in.nextToken();
return (long) in.nval;
}
public double nextDouble() throws IOException {
in.nextToken();
return in.nval;
}
public String nextString() throws IOException {
in.nextToken();
return in.sval;
}
}
}
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