var a,b,c,d,e,f:real;
begin
read(a,b,c);
d:=a+b+c;
if d>=200 then e:=d*0.8
          else e:=d*0.9;
          write(e:0:1);
          end.
/**************************************************************
	Problem: 1624
	User: admin
	Language: Pascal
	Result: Wrong Answer
****************************************************************/