#include <iostream> 
#include <string> 
#include <vector> 
#include <cmath> 
#include <algorithm> 
#include <cstdlib> 
#include <ctime> 
#include <cstdio> 
#include <functional> 
#include <set> 
#include <sstream> 
#include <cctype>

using namespace std; 


int main(){

	string s;
	cin>>s;

	int res=0;
	int num=0;

	char c=' ';
	for(int i=0;i<s.size();i++){
		if('0'<=s[i] && s[i]<='9'){
			if(c==' ') res=res*10+s[i]-'0';
			else  num=num*10+s[i]-'0';
		}
		else if(c==' ') c=s[i];
		else if(c=='*') {res+=num; num=0; c=s[i];}
		else if(c=='+') {res*=num; num=0; c=s[i];}
	}

	if(c=='*') res+=num;
	else if(c=='+') res*=num;

	cout<<res<<endl;

	return 0;
}