#include <bits/stdc++.h>
#define REP(i,n,N) for(int i=(n);i<(int)N;i++)
#define p(s) cout<<(s)<<endl
using namespace std;

int main(){
	string S;
	cin>>S;
	S+='?';
	int left=0,right=0;
	char c='*';
	REP(i,0,S.size()){
		if(isdigit(S[i])){
			right*=10;
			right+=S[i]-'0';
		}else{
			if(c=='*')	left += right;
			else	left *= right;
			right=0;
			c=S[i];
		}
	}
	p(left);
	return 0;
}