#include<algorithm>
#include<cmath>
(资料图片)
#include<cstdio>
#include<iostream>
using namespace std;
int main(){
float a,b;
char optr;
cin>>a>>b>>optr;
switch(optr){
case '+':
cout<<a+b;
break;
case '-':
cout<<a-b;
break;
case '*':
cout<<a*b;
break;
case '/':
if(b==0){
cout<<"Divided by zero!";
}
else{
cout<<a/b;
}
break;
default:
cout<<"Invalid operator!";
break;
}
return 0;
}
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