a,b,c=map(int,input().split())
ans={}
if (c+b)%a==0:
	ans[(c+b)//a]=0
if c%a==0:
	ans[c//a]=0
if len(ans)==0:
	print(-1)
else:
	t=sorted(ans.keys())
	for k in t:
		print(k)