Cod sursa(job #283081)
| Utilizator |  Petrican Teodor doruletz |
Data | 18 martie 2009 18:08:26 |
|---|---|---|---|
| Problema | Ciurul lui Eratosthenes | Scor | 20 |
| Compilator | fpc | Status | done |
| Runda | Arhiva educationala | Marime | 0.33 kb |
program sieve;
var f,g:text;
a:array[2..200000000]of 0..1;
n,i,j,b: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]=0 then begin
inc(b);
for j:=i+1 to n do
if (j mod i)=0 then a[j]:=1;
end;
writeln(g,b);
close(f); close(g);
end.
