Cod sursa(job #282956)
| Utilizator |  Petrican Teodor doruletz |
Data | 18 martie 2009 16:16:18 |
|---|---|---|---|
| Problema | Ciurul lui Eratosthenes | Scor | 0 |
| Compilator | fpc | Status | done |
| Runda | Arhiva educationala | Marime | 0.35 kb |
var f,g:text;
a:array[2..2000000000]of boolean;
i,j,b,n:longint;
begin
assign(f,'ciur.in'); reset(f);
assign(g,'ciur.out'); rewrite(g);
readln(f,n);
for i:=2 to n do
if a[i]=false then begin
a[i]:=true;
inc(b);
for j:=i+1 to n do
if (j mod i)=0 then a[j]:=true;
end;
writeln(g,b);
close(f);
close(g);
end.
