var x : int;
var y : int;
var z : int;
var a : int;
var b : int;
z := string2int(read());
x := 1;
y := 2;
x := 3;
a := 7;
y := 3 + z;
if y then
  z := 8;
  x := 3;
else
  x := 3;
  z := 7 + z;
end
b := 7 + z;
z := 10;
write(int2string(b + 10));