#include<cstdio>
#include<stack>
#include<cctype>
#include<cstring>
using namespace std;
const int NMAX=100005;
stack <int> st;
char s[NMAX];
char semn[NMAX];
int main(){
    freopen("evaluare.in","r",stdin);
    freopen("evaluare.out","w",stdout);
    int n,ind,q=0;
    gets(s);
    n=strlen(s);
    ind=0;
    st.push(0);
    while(ind<n){
        if(s[ind]=='('){
            st.push(0);
            ind++;
            int nr=0;
            while(ind<n && isdigit(s[ind])){
                nr=nr*10+(s[ind]-'0');
                ind++;
            }
            st.top()+=nr;
            continue;
        }
        if(s[ind]==')'){
            int x=st.top();
            st.pop();
            int y;
            if(!st.empty()){
                y=st.top();
                if(q){
                    if(semn[q]=='+')
                        st.top()=y+x;
                    else
                        if(semn[q]=='-')
                            st.top()=y-x;
                        else
                            if(semn[q]=='*')
                                st.top()=y*x;
                            else
                                st.top()=y/x;
                    q--;
                }
                else
                    st.top()=y+x;
                ind++;
                continue;
            }
            else{
                if(q){
                    if(semn[q]=='+')
                        st.push(y+x);
                    else
                        if(semn[q]=='-')
                            st.push(y-x);
                        else
                            if(semn[q]=='*')
                                st.push(y*x);
                            else
                                st.push(y/x);
                    q--;
                }
                else
                    st.push(y+x);
                ind++;
                continue;
            }
        }
        if(s[ind]=='+' || s[ind]=='-'){
            char ch1=s[ind];
            ind++;
            if(s[ind]=='(')
                semn[++q]=ch1;
            else{
                int nr=0;
                while(ind<n && isdigit(s[ind])){
                    nr=nr*10+(s[ind]-'0');
                    ind++;
                }
                if(s[ind]=='*' || s[ind]=='/'){
                    while(ind<n && (s[ind]=='*' || s[ind]=='/')){
                        ind++;
                        int nr1=0;
                        char ch=s[ind-1];
                        while(ind<n && isdigit(s[ind])){
                            nr1=nr1*10+s[ind]-'0';
                            ind++;
                        }
                        if(ch=='*')
                            nr*=nr1;
                        else
                            nr/=nr1;
                    }
                    int y=st.top();
                    if(ch1=='+')
                        st.top()=y+nr;
                    else
                        st.top()=y-nr;
                }
                else{
                    int y=st.top();
                    if(ch1=='+')
                        st.top()=nr+y;
                    else
                        st.top()=y-nr;
                }
            }
        }
        else{
            if(s[ind]=='*' || s[ind]=='/'){
                int nr=st.top();
                while(ind<n && (s[ind]=='*' || s[ind]=='/')){
                    ind++;
                    int nr1=0;
                    char ch=s[ind-1];
                    while(ind<n && isdigit(s[ind])){
                        nr1=nr1*10+s[ind]-'0';
                        ind++;
                    }
                    if(ch=='*')
                        nr*=nr1;
                    else
                        nr/=nr1;
                }
                st.top()=nr;
            }
        }
    }
    printf("%d", st.top());
    return 0;
}