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

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

if len(result) != 0:
    result.sort()
    for r in result:
        print(r)
else:
    print("-1")