T=int(input())
for _ in range(T):
  v,x,fo,fi,q,r=map(int,input().split())
  if fi<=fo:
    print("Zero")
  elif x+(fi-fo)*r>v:
    print("Overflow")
  elif (fi-fo)*r-fo*(q-r)==0:
    print("Safe")
  elif (fi-fo)*r-fo*(q-r)>0:
    print("Overflow")
  else:
    print("Zero")