a,b,c = map(int, input().split())
ans = []
if (b - c) % a == 0:
  ans.append((b + c) // a)
if c % a == 0 and c <= b:
  ans.append(c // a)
ans = [i for i in ans if i > 0]
if len(ans) > 0:
  ans.sort()
  print("\n".join([str(i) for i in ans]))
else:
  print(-1)