#define     «(_X_)   _X_ )
#define     Compose(_FX_,_FY_)  _FC_(_FX_,_FY_,
#define     _FC_(_X_,_Y_,*)  *,_X_,_Y_

main:
  Compose(sin,arcsin)«( 0.5, mul by '2' )
  "\n", print
{0}return