open System
let a = Console.ReadLine().Split()
let mutable tmp = 3
let mutable temp = 0
let mutable j = 0
let mutable k = 0
let f = for i in 0 .. int(a.[0]) - 1 do
j <- 0
while j < int(a.[1]) do
if (i % 2 <> 0) then
k <- 0
while k < int(a.[1]) - 1 do
temp <- i
if (temp = tmp) then
for l in 0 .. int(a.[1]) - 2 do
tmp <- tmp + 4
k <- int(a.[1]) - 1
else
if (k = int(a.[1]) - 2) then
k <- k + 1
j <- int(a.[1])
else
j <- j + 1
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