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[Gintaras]

Code:

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[color=blue]int [/color]x
[color=blue]if[/color](![color=blue]inp[/color](x)) [color=blue]ret[/color]
[color=blue]key[/color]+ V
[color=blue]wait [/color]x
[color=blue]key[/color]- V

Or, with repeating

Code:

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[color=blue]spe [/color]50
[color=blue]int [/color]x
[color=blue]if[/color](![color=blue]inp[/color](x)) [color=blue]ret[/color]
[color=blue]rep [/color]x*20
,[color=blue]key [/color]V