#include<iostream>
#include<cassert>
using namespace std;
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	string S;cin>>S;
	int idx=0;
	auto val=[&]()
	{
		int ret=0;
		while('0'<=S[idx]&&S[idx]<='9')ret=ret*10+S[idx]-'0',idx++;
		return ret;
	};
	int ans=val();
	while(idx<S.size())
	{
		char op=S[idx++];
		int t=val();
		if(op=='+')ans*=t;
		else ans+=t;
	}
	cout<<ans<<endl;
}