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var n;

do 
{
  write("Enter number of lines: ");
  n = read();
}
while (n<=0 || isNaN(n));

if (n%2 == 0)
{
  n++;
}

for (var i=1;i<=n;i++)
  {
    if (i<n/2)
      {
        for(var k=1;k<=(n/2)/(i+1);k++)
         { write(" ");
         }
          for(var j=1;j<=i;j++)
          { write("*");
          }
         
      }
         
  else
    {
      for(var k=1;k<=n+i-8;k++);
     {
      write(" ");
     }    
      for(var j=1;j<=n-i+1;j++);
    {
      write("*");
    }
   }
  write("\n");
}