Program CifraMax;
var nr, y: integer;
Function CMAX(A:integer):integer;
var
max, b, c, d: integer;
begin
b:=10000;
max:=0;
for c:=1 to 5 do
begin
d:=A div b;
if d>max then max:=d;
A:=A-b*d;
b:=b div 10;
end;
CMAX:=max;
end;
begin
write ('Introduceti un numar: ');
readln (nr);
y:=CMAX(nr);
writeln ('Cea mai mare cifra este: ',y);
readln;
end.