Cod sursa(job #154282)

Utilizator smecheru_tudyMuresan Tudor smecheru_tudy Data 11 martie 2008 07:42:18
Problema Ciurul lui Eratosthenes Scor 100
Compilator fpc Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
var v:array[1..2000000]of byte;
    n,i,j:longint;
begin
assign(input,'ciur.in');reset(input);
assign(output,'ciur.out');rewrite(output);
read(n);
for i:=2 to trunc(sqrt(n)) do
  if v[i]=0 then
   for j:=2 to n div i do   v[i*j]:=1;   j:=0;
for i:=2 to n-1 do if v[i]=0 then inc(j);
writeln(j);
close(input);close(output);
end.