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