%{
#include <stdio.h>
%}

%token DIGIT

%%

line	:	expr '\n'	{ printf("%d\n", $1); }
	;
	
expr	:	expr '+' term	{ $$ = $1 + $3; }
	|	term
	;
	
term	:	term '*' factor	{ $$ = $1 * $3; }
	|	factor
	;

factor	:	'(' expr ')'	{ $$ = $2; }
	|	DIGIT
	;
	
%%

yylex()
{
	int c;
	c = getchar();
	if(c >= '0' && c <= '9') {
		yylval = c - '0';
		return DIGIT;
	}
	
	return c;
}

yyerror(char* errmsg)
{
	fprintf(stderr, "%s\n", errmsg);
}

main(int argc, char** argv)
{
	yyparse();
	return 0;
}