T=int(input())
assert 1<=T<=20

for _ in range(T):
    N,K,H,Y=map(int,input().split())
    assert 1<=N<=pow(10,6)
    assert 1<=K<=pow(10,6)
    assert 1<=H<=pow(10,6)
    assert 1<=Y<=pow(10,12)

    A=max(N,K,H)
    assert Y//A<=pow(10,6)

print("OK")