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

int ans, temp, op;

void calc(){
	if (op) ans *= temp;
	else ans += temp;
	temp = 0;
}


int main() {
	string S;
	cin >> S;
	for (int i = 0; i < S.size(); i++)
	{
		if (S[i] == '*'){
			calc();
			op = 0;
		}
		else if (S[i] == '+'){
			calc();
			op = 1;
		}
		else{
			temp *= 10;
			temp += S[i] - '0';
		}
	}
	calc();
	cout << ans << endl;
}