#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);
}

inline 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();
    return 0;
}