uses crt;
var a,b,c,t:integer;
begin
write('nhap 3 so bat ki');readln(a,b,c);
t:=a+b+c;
write('tong la : ',t:2:3);
readln;
end.
uses crt;
var n,x,t:integer;
begin
clrscr;
readln(n);
t:=0;
while (n>0) do
begin
x:=n mod 10;
t:=t+x;
n:=n div 10;
end;
writeln(t);
readln;
end.