def main():
    A, B, C = [int(_) for _ in input().split()]

    fullfill_year = []

    l = 0
    r = 10**20
    while l <= r:
        # mは年数
        m = (r+l) // 2
        print(l, m, r)
        # 0~mに含まれるAの倍数の個数
        num_of_mul_A = m // A

        # 0~mに含まれるAの倍数以外の個数
        num_of_not_mul_A = m - num_of_mul_A

        total_money = num_of_mul_A * B + num_of_not_mul_A

        print(total_money)
        if total_money == C:
            fullfill_year.append(m)
            break
        elif total_money > C:
            fullfill_year.append(m)
            r = m-1
        else:
            l = m+1

    print(min(fullfill_year))

main()