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RGB8060 - Замын урт

Чиглэлгүй графын 2 оройн хоорондох хамгийн богино замыг ол.

Input

Эхний мөрөнд графын оройн тоо N өгөгдөнө. ( 1<=N<=100 )

Дараагийн N мөрөнд холболтын матриц өгөгдөнө. ( Ирмэг оршин байвал 1, үгүй бол 0 )

Дараагийн мөрөнд эхлэл ба төгсгөлийн 2 оройн дугаар өгөгдөнө.

Output

Замын урт. ( Явж болох ирмэгүүдийн тоо )

Example

Input:
5
0 1 0 0 1
1 0 1 0 0
0 1 0 0 0
0 0 0 0 0
1 0 0 0 0
3 5

Output:
3

Нэмсэн:Bataa
Огноо:2010-01-29
Хугацааны хязгаарлалт:1s
Эх кодын хэмжээний хязгаарлалт:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Програмчлалын хэлүүд:ADA95 ASM32 ASM64 BASH BF C CSHARP C++ 4.3.2 CPP CPP14 C99 CLPS LISP sbcl LISP clisp D ERL FORTRAN HASK ICON ICK JAVA JS-RHINO LUA NEM NICE OCAML PAS-GPC PAS-FPC PERL PHP PIKE PRLG-swi PYTHON RUBY SCALA SCM guile SCM qobi ST TCL TEXT WHITESPACE

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2024-03-10 05:18:32
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⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠸⣭⣽⠿⠇⠀⣿⠯⢿⣻⠇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
2023-12-23 07:07:23
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