#include <bits/stdc++.h> using namespace std; stack<int> x; int main() { int a,b; char c; cin>>a; x.push(a); while(cin>>c>>b) { if(c=='*') { a=x.top(); x.pop(); x.push(a*b); } else x.push(b); } a=0; while(x.size()) { a+=x.top(); x.pop(); } cout<<a<<endl; return 0; }