#include <stdlib.h>
char *t;double a[9],A,*p;main(f,s,n){for(p=a;gets(s);printf(f?"ERR\n":*p-floor(*p)?"%.1f\n":"%.f\n",*p))for(f=n=0;t=strtok(n?0:s," ");n=*t-41,n>6&&n<17?++p:--p,A=p[1],*p=n>32?n>64?fmod(*p,A):pow(*p,A):n-2?n-4?n-1?n-6?atof(t):A?*p/A:*p*(f=1):*p*A:*p-A:*p+A);}