Imports System
Public Module Module1
Public Sub Main()
dim marks(5) as integer
for x = 1 to 5
marks(x) = console.readline()
if marks(x) > 50 then
console.WriteLine("invalid marks")
else if marks(x) < 0 then
end if
next
if 0 < marks(5) < 50 then
console.writeline(marks(5) / 50 * 100 & ("%"))
End Sub
End Module