[Link] https://www.acmicpc.net/problem/6549
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import java.util.*;
import java.io.*;
public class Main{
public static void main(String[] args) throws IOException{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String[] line;
int n, w = 0;
long max = 0;
Stack<Integer> stack = new Stack<>();
StringBuilder sb = new StringBuilder();
while(true) {
max = 0;
line = br.readLine().split(" ");
n = atoi(line[0]);
long[] ha = new long[line.length - 1];
for(int i = 0; i < ha.length; i++) ha[i] = atol(line[i + 1]);
int i = 0;
if(n == 0) break;
stack.clear();
while(i < n) {
long h = ha[i];
if(!stack.isEmpty()) {
if(ha[stack.peek()] <= h) {
stack.push(i++);
}
else {
while(!stack.isEmpty() && ha[stack.peek()] >= h) {
long height = ha[stack.pop()], width = stack.isEmpty() ? i : i - 1 - stack.peek();
max = Math.max(max, height * width);
}
stack.push(i++);
}
} else {
stack.push(i++);
}
}
i = n;
while(!stack.isEmpty()) {
long height = ha[stack.pop()], width = stack.isEmpty() ? n : n - 1 - stack.peek();
max = Math.max(max, height * width);
}
sb.append(max + "\n");
}
System.out.println(sb);
}
public static int atoi(String s) { return Integer.parseInt(s); }
public static long atol(String s) { return Long.parseLong(s); }
}