Cod sursa(job #16178)
Utilizator | Voroneanu Radu Stefan radu_voroneanu | Data | 12 februarie 2007 15:56:34 |
---|---|---|---|
Problema | Fractii | Scor | 10 |
Compilator | fpc | Status | done |
Runda | Arhiva de probleme | Marime | 0.44 kb |
var n:longint;
a:array[1..1000000] of boolean;
s,i,j:longint;
f,g:text;
function cmmdc(x,y:longint):longint;
begin
while x<>y do
if y>x then
y:=y-x
else
x:=x-y;
cmmdc:=x;
end;
begin
assign(f,'fractii.in'); reset(f);
assign(g,'fractii.out'); rewrite(g);
readln(f,n);
s:=0;
for i:=1 to n do
for j:=1 to i do
if cmmdc(i,j)=1 then
inc(s,2);
writeln(g,s-1);
close(g); close(f);
end.