#include <cstdio>
#include <stack>
#include <cctype>
#include <cstring>
using namespace std;

const int nmx = 100005;

char s[nmx];
stack <int> st;
stack <char> ST;

int prioritate(const char c)
{
    if(c == '(' || c == ')')
        return 0;
    if(c == '+' || c == '-')
        return 1;
    return 2;
}

int calc(int val1, int val2, char semn)
{
    if(semn == '+')
        return val1 + val2;
    if(semn == '-')
        return val1 - val2;
    if(semn == '*')
        return val1 * val2;
    return val1 / val2;
}

int evaluare()
{
    int val1, val2;
    ST.push('(');
    int lun = strlen(s) + 1;
    s[lun-1] = ')';
    for(int i = 0; i < lun; ++i)
    {
        if(s[i] == '(')
        {
            ST.push('(');
            continue;
        }
        if(s[i] == ')')
        {
            while(not ST.empty() && ST.top() != '(')
            {
                /// val2 - val1
                val2 = st.top();
                st.pop();
                val1 = st.top();
                st.pop();
                int aux =calc(val1,val2,ST.top());
                st.push(calc(val1,val2,ST.top()));
                ST.pop();
            }
            ST.pop();
            continue;
        }
        if(isdigit(s[i]))
        {
            val1 = 0;
            while(isdigit(s[i]))
            {
                val1 = val1 * 10 + (int)s[i] - 48;
                ++ i;
            }
            -- i;
            st.push(val1);
            continue;
        }
        while(prioritate(ST.top()) >= prioritate(s[i]))
        {
            val2 = st.top();
            st.pop();
            val1 = st.top();
            st.pop();
            st.push(calc(val1,val2,ST.top()));
            ST.pop();
        }
        ST.push(s[i]);
    }
    return st.top();
}

int main()
{
    freopen("evaluare.in" ,"r", stdin);
    freopen("evaluare.out", "w", stdout);
    scanf("%s", s);
    printf("%d\n", evaluare());
    return 0;
}