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

result = []

if (B+C)%A == 0:
    result.append((B+C)//A)
if B >= C and C%A == 0:
    result.append(C//A)

if len(result) > 0:
    outPut = sorted(result)
    print(*outPut, sep="\n")
else:
    print(-1)