// a program
const n=3;
var r,x,n16;
func multiply(a,b)
var c,d;
begin
    c:=0;
    while 1 do
    begin
        if b<=0 then break; 
        if odd b then c:= c+a;
        a:=2 * a; b:=b/%2;
    end;
    return c;
end;

// comment here
func gcd(f,g)
begin
    for(;f!=g;)
    begin
        if f<g then g:=g-f
        elif g<f then f:= f-g
        else continue; 
    end;
    return g;
end; 

begin
    
    if 0 then 1
    elif 0 then 1
    else r:=n16:=3! >5 ? 2^4:1 ;
    x:=multiply(4,n); 
    r:=gcd(multiply(4,n),multiply(1,n16)); ; ;
    print('r=%d,x=%d,n16=%d ',r,x,n16)
end.