#include<iostream>
using namespace std;
int main(){
int a,b;
char c;
cin >> a >> b >> c;
if (c == '+'){
cout << a + b;
}
else if (c == '-'){
cout << a - b;
}
else if (c == '*'){
cout << a * b;
}
else if (c == '/'){
if (b != 0) cout << a / b;
}
else{
cout << "Invalid operator!";
}
return 0;
}
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