using System;
public class Program
{
public static void Main()
int[] arr = {10, 2, 4, 30, 35};
int a=returnno(arr);
//Console.WriteLine("Hello World");
Console.WriteLine(a);
}
public static int returnno(int []arr)
int max=-1;
for(int i=0;i<arr.Length;i++)
for(int j=0;j<arr.Length;j++)
for(int k=j;k<arr.Length;k++)
int mul= arr[j]*arr[k];
if(mul==arr[i])
max= arr[i];
if(mul>max)
max=mul;
return max;