#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>



int main() {

       int i,j; // pro cyklus
       double number1, number2, summary, rsum, msum; /*aby se mohlo počítat s desetinnými čísly*/
       char operand, equ; //načítání znaků
         
      scanf("%lf", &number1); // nacte prvni cislo, znamenko, druhe cislo
      scanf("%c", &operand);
      scanf("%lf", &number2);
      scanf("%c", &equ);
      scanf("%lf",&msum);
      
            
          /*pokud se operand rovna deleni a delitel se rovna nule vypise chybu*/
          if((operand == '/') && (number2 == 0)){
                printf("Nulou sa nedá deli");
          }
          if(operand !='+' && operand !='-' && operand !='*' && operand !='/'){
              return 1;
              printf("\n");  
          }         
          if(equ !='='){
             return 1;
             printf("\n");
            
          }                  
          
          else if(operand=='+'){
                        rsum=number1+number2;
                        if(msum==rsum){
                          printf("OK\n");
                        }
                        else{
                          printf("ZLE\n");
                        }
                        printf("%lf\n",rsum);
          } 
          else if(operand=='-'){
                        rsum=number1-number2;
                        if(msum==rsum){
                          printf("OK\n");
                        }
                        else{
                          printf("ZLE\n");
                        }
                        printf("%lf\n",rsum);
          }
          else if(operand=='*'){
                        rsum=number1*number2;
                        if(msum==rsum){
                          printf("OK\n");
                        }
                        else{
                          printf("ZLE\n");
                        }
                        printf("%lf\n",rsum); 
          }
          else if(operand=='/'){
                        rsum=number1/number2;
                        if(msum==rsum){
                          printf("OK\n");
                        }
                        else{
                          printf("ZLE\n");
                        }
                        printf("%lf\n",rsum);
          }  
}