#define _USE_MATH_DEFINES

#include <iostream>
#include <iomanip>

#include <algorithm>
#include <cmath>

#include <string>
#include <list>
#include <queue>
#include <vector>
#include <complex>

/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) std::cout<<(p)<<std::endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
    std::cin.tie(0);
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed;//
    //cout << setprecision(6);//
	
	string s;
	cin>>s;
	int ans=0;
	int temp = 0;
	char opp = '-';
	rep(i,s.size()){
		if(s[i]=='*' || s[i]=='+'){
			if(opp=='*'){
				ans = ans + temp;
			}else if(opp=='+'){
				ans = ans * temp;
			}else{
				ans = temp;
			}
			temp = 0;
			opp = s[i];
			
		}else{
			temp = temp*10 + s[i] -'0';
		}
	}
	if(opp=='*'){
		ans = ans + temp;
	}else if(opp=='+'){
		ans = ans * temp;
	}
	P(ans);
	return 0;
}