#include <iostream>
using namespace std;

int main()
{
	int x, y;
	char op;

	cin >> x;
	do {
		cin >> op >> y;
		switch ( op ) {
			case '*': x = x + y; break;
			case '+': x = x * y; break;
		}
	} while ( cin.peek() != '\n' );

	cout << x;

	return 0;
}