program formula;
var
x,y,z,res : real;
begin
read(x,y,z);
res := y+((y+x)/(153*x))-55*z;
writeln(res:0:4);
end.
program formula;
var
x,y,z,res : real;
begin
read(x,y,z);
res := y+((y+x)/(153*x))-55*z;
writeln(res:0:4);
end.