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Cod sursa(job #567341)
var f,g:text;
k,i,j,n,d:integer;
begin
assign(f,'fractii.in');reset(f);
assign(g,'fractii.out');rewrite(g);
while not eof(f) do begin
readln(f,n);
k:=0;
for i:=1 to n do
for j:=1 to n do begin
if (i=1) and (j=1) then k:=k+1;
if (i<>j) and (i mod j<>0) or (j mod i<>0) then begin
if (i>j) then d:=i-j
else d:=j-1;
if d=1 then k:=k+1;
if (d<>1) and(i mod d<>0) and (j mod d<>0) and(d mod i<>0) and (d mod j<>0)then k:=k+1;
end; end;
writeln(g,k);
end;
close(f);
close(g);
end.