#include<bits/stdc++.h>
using namespace std;
int main(){
	int s;
	string a;
	cin>>a;
	s=a[0]-48;
	for(int i=1;i<a.size();i+=2){
		if(a[i]=='+') s=s+(a[i+1]-48);
		if(a[i]=='-') s=s-(a[i+1]-48);
		if(a[i]=='*') s=s*(a[i+1]-48);
	}
	cout<<s;
return 0;}

/**************************************************************
	Problem: 1122
	User: fzy001
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2076 kb
****************************************************************/