#include<stdio.h>

int main()
{

    int num,sum,error=0;
    char op='0';

    scanf("%d",&sum);

    scanf("%c",&op);

    do{

        if(op=='=') break;

        scanf("%d",&num);

        if(op=='+'){

            sum+=num;

        }else if(op=='-'){

            sum-=num;

        }else
 
 if(op=='*'){

            sum*=num;

        }else if(op=='/'){

            if(num==0){

                error=1;
                break;

            }else sum/=num;

        }else{

            error=1;
            break;

        }

        scanf("%c",&op);

    }while(op!='=');

    if(error){

        printf
 
("ERROR");

    }else{

        printf("%d",sum);

    }

    return 0;

}