#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int (i) = 0 ; (i) < (int)(n) ; (i)++)
#define REP(i,a,b) for(int (i) = a ; (int)(i) <= (int)(b) ; (i)++)
#define all(n) (n).begin(),(n).end()
typedef long long ll;
typedef vector<int> Vi;
typedef vector<Vi> VVi;
typedef pair<long long,long long> Pii;
typedef vector<Pii> VPii;


string s;
int p;
int g(){
	int num = 0;
	while( s[p] >= '0'  && s[p] <= '9' ) 
		num = num * 10 + s[p++] - '0';
	return num;
}

int f(){
	int ans = g();
	while( s[p] == '+' || s[p] == '*' ){
		if( s[p++] == '*' ){
			ans += g();
		}else{
			ans *= g();
		}
	}
	return ans;
}
int main(){
	cin >> s;
	
	cout << f() << endl;
	
}