func main()
	var n: int :: cui@inputInt()
	var w: []int :: #[n]int
	for i(0, n - 1)
		do w[i] :: cui@inputInt()
	end for
	
	var dp: []bool :: #[10001]bool
	do dp[0] :: true
	var sum: int :: 0
	for i(0, n - 1)
		do sum :+ w[i]
		for j(10000, 0, -1)
			if(dp[j])
				do dp[j + w[i]] :: true
			end if
		end for
	end for
	
	var ans: bool :: sum % 2 = 0 & dp[sum / 2]
	do cui@print((ans ?("", "im")) ~ "possible\n")
end func