program Zada4a_7;

{$APPTYPE CONSOLE}

var
a,b,c,d,e:real;
begin
write('a=');readln(a);
write('b=');readln(b);
write('c=');readln(c);
write('a+b+c=');readln(d);
e:=a+b+c;
if d=e then write('correct');
if d<>e then write('wrong');
readln;
end.