#include<fstream>
#include<stack>
using namespace std;
ifstream fin("evaluare.in");
ofstream fout("evaluare.out");
string s;
stack<int>nums;
stack<char>ops;
void operation()
{
    char op=ops.top();
    ops.pop();
    int b=nums.top();
    nums.pop();
    int a=nums.top();
    nums.pop();
    if(op=='+') nums.push(a+b);
    if(op=='-') nums.push(a-b);
    if(op=='*') nums.push(a*b);
    if(op=='/') nums.push(a/b);
}
int priority(char c)
{
    if(c=='+'||c=='-') return 1;
    if(c=='*'||c=='/') return 2;
    return 0;
}
void solve()
{
    int p,x;
    ops.push('1');
    for(int i=0;i<s.size();i++)
    {
        if(s[i]=='(')
            ops.push(s[i]);
        else
        {
            if(s[i]==')')
            {
                while(ops.top()!='(')
                    operation();
                ops.pop();
            }
            else
            {
                p=priority(s[i]);
                if(p)
                {
                    while(priority(ops.top())>=p)
                        operation();
                    ops.push(s[i]);
                }
                else
                {
                    for(x=0;isdigit(s[i]);i++)
                        x=x*10+(s[i]-'0');
                    nums.push(x);
                    i--;
                }
            }
        }
    }
    while(ops.size()>1)
        operation();
}

int main()
{
    fin>>s;
    solve();
    fout<<nums.top();
}