Cod sursa(job #288550)
| Utilizator |  Popescu George gapdan |
Data | 25 martie 2009 21:47:01 |
|---|---|---|---|
| Problema | Ciurul lui Eratosthenes | Scor | 20 |
| Compilator | fpc | Status | done |
| Runda | Arhiva educationala | Marime | 0.31 kb |
var f,g:text;n,i,k,j,q:longint;
begin
assign(f,'ciur.in');reset(f);
assign(g,'ciur.out');rewrite(g);
readln(f,n);
q:=0;
for i:=2 to n do begin
k:=0;
for j:=2 to i div 2 do begin
if (i mod j=0)and(j<>i) then begin inc(k);break;end;
end;
if k=0 then inc(q);
end;
write(g,q);
close(F);
close(g);
end.