#include <iostream>
#include <string>
#include <vector>
using namespace std;
int main(){
	string S;
	cin >> S;
	int N = S.size();
	vector<int> num(1, 0);
	vector<char> op;
	for (int i = 0; i < N; i++){
		if (isdigit(S[i])){
			num.back() *= 10;
			num.back() += S[i] - '0';
		} else {
			op.push_back(S[i]);
			num.push_back(0);
		}
	}
	int M = num.size();
	int ans = num[0];
	for (int i = 1; i < M; i++){
		if (op[i - 1] == '+'){
			ans += num[i];
		}
		if (op[i - 1] == '*'){
			ans *= num[i];
		}
	}
	cout << ans << endl;
}