street is developed as follows: the main line comprises of 1 tile; then, at that point, a1 lines follow; every one of these lines contains 1 tile more noteworthy than the past line; then, at that point, b1 columns follow; every one of these lines contains 1 tile not exactly the past line; then, at that point, a2 columns
Control structures
Control structures are block of statements that analyze the value of variables and determine the flow of execution based on those values. When a program is running, the CPU executes the code line by line. After sometime, the program reaches the point where it has to make a decision on whether it has to go to another part of the code or repeat execution of certain part of the code. These results affect the flow of the program's code and these are called control structures.
Switch Statement
The switch statement is a key feature that is used by the programmers a lot in the world of programming and coding, as well as in information technology in general. The switch statement is a selection control mechanism that allows the variable value to change the order of the individual statements in the software execution via search.
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street is developed as follows:
the main line comprises of 1 tile;
then, at that point, a1 lines follow; every one of these lines contains 1 tile more noteworthy than the past line;
then, at that point, b1 columns follow; every one of these lines contains 1 tile not exactly the past line;
then, at that point, a2 columns follow; every one of these lines contains 1 tile more noteworthy than the past line;
then, at that point, b2 lines follow; every one of these columns contains 1 tile not exactly the past line;
...
then, at that point, a lines follow; every one of these columns contains 1 tile more prominent than the past line;
then, at that point, bn columns follow; every one of these lines contains 1 tile not exactly the past line.
You start from the main tile in the primary line and need to arrive at the last line (any tile of it). From your present tile, you can move to any tile in the following column which contacts your present tile.
Ascertain the number of various ways from the primary line to the last line. Since it tends to be enormous, print it modulo 998244353.
Input
The main line contains one integer n (1≤n≤1000).
Then, at that point, n lines follow. The I-th of them contains two integers computer based intelligence and bi (1≤ai,bi≤105; |ai−bi|≤5).
Extra limitation on the input: the succession of
Output
Print one integer — the number of ways from the main line to the last line, taken modulo 998244353.
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