Ответы на вопрос:
Const n=50; var a : array [1..n] of boolean; x,y, sim : integer; begin sim: =0; a[1] : = false; for x: =2 to n do a[x] : = true; for x: = 2 to n div 2 do for y: = 2 to n div x do a[x*y] : = false; for x: =1 to n do if a[x] then sim: =sim+1; writeln(sim); end.
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