5249: B3698 [语言月赛202301] 一次函数(入门)
Memory Limit:128 MB
Time Limit:1.000 S
Judge Style:Text Compare
Creator:
Submit:0
Solved:0
Description

Input

Output

Sample Input Copy
5 3 0
0 0
1 3
2 7
3 9
-1 -4
Sample Output Copy
3
HINT
