Var
A,B,x:integer;
y:real;
begin
readln(A,B,x);
if x=3
then
y:=(B-sin(B))/A
else
if x=7
then
y:=A*B-B*A/x
else
if x=10
then
y:=x+A
else
if (x mod 3 =0) and (x>6)
then
y:=B-x
else
if (x mod 5 = 0) and (x mod 4 = 0) and (x<65) and (x<>60)
then
y:=x
else
y:=35;
writeln('y(',x,')=',y);
end.