#include <stack>
#include <cstdio>
#include <cctype>
using namespace std;
 
int pop(stack<int> &S) { int v=S.top(); S.pop(); return v; }
 
int main()
  {
   while(true)
     {
      stack<int> S;
      for(int ch;(ch=getchar())!='\n';)
        {
         if(isdigit(ch)) S.push(ch-'0');
         else if(ch=='+') S.top()+=pop(S);
         else if(ch=='*') S.top()*=pop(S);
         else if(ch=='-') S.top()-=pop(S);
         else if(ch==EOF) return 0;
        }
      printf("%d\n",S.top());
     }
  }
 

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NgoyOC0KMjgxLSoKOQo0Ny0KMjUrMTctKjMyKysK

6
28-
281-*
9
47-
25+17-*32++