题目描述
We have a sandglass that runs for X seconds. The sand drops from the upper bulb at a rate of 1 gram per second. That is, the upper bulb initially contains X grams of sand.
How many grams of sand will the upper bulb contains after t seconds?
-----Constraints-----
- 1≤X≤10^9
- 1≤t≤10^9
- X and t are integers.
-----Input-----
The input is given from Standard Input in the following format:
X t
-----Output-----
Print the number of sand in the upper bulb after t second.
-----Sample Input-----
100 17
-----Sample Output-----
83
17 out of the initial 100 grams of sand will be consumed, resulting in 83 grams.
输入格式
见题面
输出格式
见题面
样例输入
100 17
样例输出
83