#include <bits/stdc++.h> using namespace std;

int main() { int a, b; char c; cin >> a >> b >> c; switch (c) { 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!"; } return 0; }