%token NUMBER;expression :  term<n> { printf("%d\n", n); };term<n> :  term<x> '+' factor<y> { *n = x+y; }| term<x> '-' factor<y> { *n = x-y; }| factor<n>;factor<n> :  factor<x> '*' primary<y> { *n = x*y; }| factor<x> '/' primary<y> { *n = x/y; }| primary<n>;primary<n> :  NUMBER<n>| '(' term<n> ')'| '-' primary<x> { *n = -x;};