program Gafforov_A_9V
const m: array [1..3] of integer =(525,315,210);
var i, x, y, z: integer
procedure nod (a, b: integer; var c: integer);
begin
while a<>b do
if a>b then a:=a-b else b:=b-a;
c:=a
end;
begin
x:=m[1]
for i:=2 to 3 do
begin
y:=m[i];
nod (x, y, z) ;
x:=z
end;
writeln ('НОД=', x)
end.