a,b,c=map(int,input().split())

ans=[]
if (b+c)%a==0:
    ans.append((b+c)//a)

if c<=b and c%a==0:
    ans.append(c//a)

ans.sort()

if len(ans)!=0:
    for x in ans:
        print(x)
else:
    print(-1)