#include <bits/stdc++.h>

#define scanf (void)!scanf

using namespace std;

inline void Open(const string Name) {
    #ifndef ONLINE_JUDGE
        (void)!freopen((Name + ".in").c_str(), "r", stdin);
        (void)!freopen((Name + ".out").c_str(), "w", stdout);
    #endif
}

bool delim(char c) {
    return c == ' ';
}

bool is_op(char c) {
    return c == '+' || c == '-' || c == '*' || c == '/';
}

int priority(char op) {
    if(op == '+' || op == '-')
        return 1;
    if(op == '*' || op == '/')
        return 2;
    return -1;
}

void process_op(stack <int> &st, char op) {
    int r = st.top(); st.pop();
    int l = st.top(); st.pop();

    switch(op) {
        case '+' : st.push(l + r); break;
        case '-' : st.push(l - r); break;
        case '*' : st.push(l * r); break;
        case '/' : st.push(l / r); break;
    }
}

int evaluate(const char s[]) {
    stack <int> st;
    stack <char> op;

    for(int i = 0;s[i];i++) {
        if(delim(s[i])) continue;
        if(s[i] == '(') {
            op.push('(');
        } else if(s[i] == ')') {
            while(op.top() != '(') {
                process_op(st, op.top());
                op.pop();
            }
            op.pop();
        } else if(is_op(s[i])) {
            char cur_op = s[i];
            while(!op.empty() && priority(op.top()) >= priority(cur_op)) {
                process_op(st, op.top());
                op.pop();
            }
            op.push(cur_op);
        } else {
            int number = 0;
            while(s[i] && isalnum(s[i]))
                number = number * 10 + s[i++] - '0';
            i--;
            st.push(number);
        }
    }

    while(!op.empty()) {
        process_op(st, op.top());
        op.pop();
    }

    return st.top();
}

int main() {
    Open("evaluare");

    char s[100001];
    scanf("%s", s);
    printf("%d", evaluate(s));
}