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#include <bits/stdc++.h>
using namespace std;
int main() {
int num1, num2;
char op;
cin >> num1 >> num2 >> op;
switch (op) {
case '+':
cout << num1 + num2 << endl;
break;
case '-':
cout << num1 - num2 << endl;
break;
case '*':
cout << num1 * num2 << endl;
break;
case '/':
if (num2 == 0) cout << "Divided by zero!" << endl;
else cout << num1 / num2 << endl;
break;
default:
cout << "Invalid operator!" << endl;
break;
}
return 0;
}