program p1;
label 1;
var
m, n: integer;
prod: char;
begin
1:
write('M= ');
readln(m);
write('N= ');
readln(n);
repeat
if n > m then
n := n mod m
else
m := m mod n;
until (m = 0) or (n = 0);
writeln('NOD= ', m + n);
write('Vi xotite prodoljiti? (y/n) ');
readln(prod);
if prod = 'y' then
goto 1;
readln;
end.