var a,a1,a2,a3: integer;
begin
readln(a);
a1:=a div 100;
a2:=a div 10 mod 10;
a3:=a mod 10;
writeln((a1+a2=a3)or(a1+a3=a2)or(a2+a3=a1));
end.
var a,a1,a2,a3: integer;
begin
readln(a);
a1:=a div 100;
a2:=a div 10 mod 10;
a3:=a mod 10;
writeln((a1+a2=a3)or(a1+a3=a2)or(a2+a3=a1));
end.