Given a simple high-school level math question, you are required to solve it and provide the final answer. The final answer is always a single number. These questions can range from a variety of topics like simple arithmetic, solving equations, converting a quantity from one unit to another, finding remainders/GCD/LCM, finding probabilities etc. Each question has only one correct answer. This answer can be a positive or negative integer, a fraction or a decimal number. If the answer is a negative number use the hyphen (e.g. -42) symbol for the minus sign. For decimal numbers, do not add extra zeros after the decimal point. For fractional numbers, separate the numerator and denominator using a forward slash (e.g. 3/25).

Input: Consider Input: Suppose -w = 0, -1 = -m + w + 17. Calculate the highest common factor of m and 45.

Output: 9


Input: Consider Input: Divide -1830 by -6.

Output: 305


Input: Consider Input: What is prob of sequence fff when three letters picked without replacement from {h: 1, j: 2, v: 1, f: 1}?


Output: 0