def main():

    x, y, z = list(map(int, input().split()))



    print(((x - z) // (y + z)))





if __name__ == "__main__":

    main()

def main():

    x, y, z = list(map(int, input().split()))



    for i in range(1, 10 ** 5 + 1):

        if (z + y) * i + z > x:

            print((i - 1))

            exit()





if __name__ == "__main__":

    main()

def main():
    x, y, z = list(map(int, input().split()))
    print(((x - z) // (y + z)))


if __name__ == "__main__":
    main()

def main():
    x, y, z = list(map(int, input().split()))
    for i in range(1, 10**5 + 1):
        if (z + y) * i + z > x:
            print((i - 1))
            exit()


if __name__ == "__main__":
    main()

-    print(((x - z) // (y + z))) +    for i in range(1, 10**5 + 1): +        if (z + y) * i + z > x: +            print((i - 1)) +            exit()