n, t = map(int, input().split())
books = list(map(int, input().split()))

dp = [False] * (t + 1)
dp[0] = True

for book in books:
    for i in range(t, book - 1, -1):
        if dp[i - book]:
            dp[i] = True

if dp[t]:
    print("PERFEITO!")
else:
    print("IMPOSSIVEL!")