#include <fstream>
#include <vector>
#include <algorithm>
#include <set>
#include <stack>
#include <cctype>

using namespace std;
int aplic(int a,int b,char c)
{
    if(c=='+')return a+b;
    if(c=='-')return a-b;
    if(c=='/')return a/b;
    return a*b;
}
int cod(char ch)
{
    if(ch=='/')return 2;
    if(ch=='*')return 3;
    if(ch=='-' || ch=='+')return 1;
    return 0;
}
stack<int>val;
stack<char>op;
void calc()
{
    int v2=val.top();
    val.pop();
    int v1=val.top();
    val.pop();
    char o=op.top();
    op.pop();
    val.push(aplic(v1,v2,o));
}
int solve(string s)
{
    s='('+s+')';
    int n=s.size()-1;
    for(int i=0;i<=n;i++)
    {
        if(s[i]==' ')continue;
        if(s[i]=='(')
        {
            op.push(s[i]);
        }
        else if(isdigit(s[i]))
        {
            int x=0;
            while(i<=n && isdigit(s[i]))
            {
                x=x*10+s[i]-'0';
                i++;
            }
            val.push(x);
            i--;
        }
        else if(s[i]==')')
        {
            while(op.top()!='(')
            {
                calc();
            }
            op.pop();
        }
        else
        {
            while(cod(s[i])<=cod(op.top()))
            {
                calc();
            }
            op.push(s[i]);
        }

    }
    return val.top();
}
main()
{
    ifstream cin("evaluare.in");
    ofstream cout("evaluare.out");
    string s;
    getline(cin,s);
    cout<<solve(s);
}