#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<to;x++)
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
//-------------------------------------------------------

string S;

void solve() {
	int i,j,k,l,r,x,y; string s;
	cin>>S;
	
	FOR(i,S.size()) if(S[i]=='+' || S[i]=='*') break;
	x=atoi(S.substr(0,i).c_str());
	S=S.substr(i);
	while(S.size()) {
		for(i=1;i<S.size();i++) if(S[i]=='+' || S[i]=='*') break;
		if(S[0]=='*') x+=atoi(S.substr(1,i-1).c_str());
		if(S[0]=='+') x*=atoi(S.substr(1,i-1).c_str());
		S=S.substr(i);
	}
	
	cout<<x<<endl;
	
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false);
	FOR(i,argc-1) s+=argv[i+1],s+='\n';
	FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	solve(); return 0;
}