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

int main () {
	int n, m;
	char r;
	cin >> n >> m >> r;
	if ( r == '+' ) cout << m + n;
	else if ( r == '*' ) cout << m * n;
	else if ( r == '-' ) {
		if ( n > m ) cout << n - m;
		else if ( n < m ) cout << m - n;
		else cout << m - n;
	} else if ( r == '/' ) {
		if ( m == 0 ) cout << "Divided by zero!";
		else if ( n > m ) cout << n / m;
		else if ( n < m ) cout << m / n;
	} else cout << "Invalid operator!";
	return 0;
}