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E. Out of Controls

time limit per test

2 secondsmemory limit per test

64 megabytesinput

standard inputoutput

standard outputYou are given a complete undirected graph. For each pair of vertices you are given the length of the edge that connects them. Find the shortest paths between each pair of vertices in the graph and return the length of the longest of them.

Input

The first line of the input contains a single integer *N* (3 ≤ *N* ≤ 10).

The following *N* lines each contain *N* space-separated integers. *j*th integer in *i*th line *a*_{ij} is the length of the edge that connects vertices *i* and *j*. *a*_{ij} = *a*_{ji}, *a*_{ii} = 0, 1 ≤ *a*_{ij} ≤ 100 for *i* ≠ *j*.

Output

Output the maximum length of the shortest path between any pair of vertices in the graph.

Examples

Input

3

0 1 1

1 0 4

1 4 0

Output

2

Input

4

0 1 2 3

1 0 4 5

2 4 0 6

3 5 6 0

Output

5

Note

You're running short of keywords, so you can't use some of them:

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