def ascan; gets.split.map(&:to_i); end
def scan; gets.to_i; end

n,m = ascan

if 6<=n
    puts "Possible"
    exit 0
end

if n == 5 || n == 3 || n == 4
    puts "Possible"
elsif n == 2 || n == 1
    if m != 0
        puts "Possible"
    else
        puts "Impossible"
    end
else
    abort
end