#include<bits/stdc++.h>
using namespace std;
int a,c; char b;
int main(){
    scanf("%d%c%d",&a,&b,&c);
    switch(b){
        case '+':printf("%d",a+c);break;
        case '-':printf("%d",a-c);break;
        case '*':printf("%d",a*c);break;
        case '/':{
            if(c==0) printf("Divided by zero!");
            else printf("%d",a/c);
            break;
        }
        default:printf("Invalid operator!");
    }
    return 0;
}