A,B,C = map(int,input().split())

res = []
if (B+C)%A == 0 and (B+C)//A > B/A:
    res.append((B+C)//A)
if C%A == 0 and C//A <= B/A:
    res.append(C//A)
res.sort()
if not res: print(-1)
else:
    for r in res:
        print(r)