func main()
	var N: int :: cui@input().toInt(&)
	var _: [][]char :: cui@input().split(" ")
	var W: []int :: #[N]int
	for i(0, N - 1)
		do W[i] :: _[i].toInt(&)
	end for
	var dp: []bool :: #[10001]bool
	do dp[0] :: true
	var sum: int
	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