#include<string>
#include<vector>
#include<iostream>
using namespace std;

int main(){
	string str;
	vector<int> num;
	vector<char> ope;
	ope.push_back('*');
	cin>>str;
	int now_integer=0;
	for(auto &s:str){
		switch(s){
			case '+':
			case '*':
				num.push_back(now_integer);
				ope.push_back(s);
				now_integer=0;
				break;
			default:
				now_integer*=10;
				now_integer+=(s-'0');
				break;
		}
	}
	num.push_back(now_integer);
	int res=0;
	for(int i=0;i<(int)num.size();i++){
		switch(ope[i]){
		case '*':res+=num[i];break;
		case '+':res*=num[i];break;
		}
	}

	cout<<res<<endl;
}