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// clang-format off
// #pragma GCC optimize("O3")
// #pragma GCC target("avx,avx2")
#include <iostream>
#include <string>
#include <sstream>
#include <cmath>
#include <memory.h>
#include <algorithm>
#include <stack>
#include <deque>
#include <iomanip>
#include <stdio.h>
#include <queue>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <ctime>
#include <cstdlib>
#include <cassert>
#include <chrono>
#include <array>
#define int long long
#define pii pair<int, int>
#define pb push_back
#define all(vc) vc.begin(), vc.end()
#define fir first
#define sec second
#define endl "\n"
#define un unsigned
#define INF 1000000009
#define double long double
using namespace std;

const int N = 1000005, R = 1 << 20, MOD = 1e9 + 7, ABC = 26, logn = 19;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

int sign(int a) {
    if (a > 0)
        return 1;
    return -1;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    srand(time(0));

    string s;
    cin >> s;

    s += '+';

    vector<int> zn(1, 0);
    vector<char> hui;
    int sig = 1;
    if (s[0] == '-')
        sig = -1;

    int k = 0;
    for (int i = 0; i < s.size(); i++) {
        if (s[i] >= '0' && s[i] <= '9') {
            k = k * 10 + s[i] - '0';
            continue;
        }
        if (s[i] == '-' || s[i] == '+') {
            zn.push_back(sig * k);
            k = 0;
            if (s[i] == '-')
                sig = -1;
            else
                sig = 1;
            continue;
        }

        char c = s[i];
        i++;
        zn.push_back(k*sig);
        k = 0;
        sig = 1;

        while (i < s.size() && s[i] != '+' && s[i] != '-') {
            if (s[i] >= '0' && s[i] <= '9') {
                k = k * 10 + s[i] - '0';
                i++;
                continue;
            }
            if (c == '/')
                k = abs(zn.back()) * sign(zn.back()) / k * sig;
            if (c == '*')
                k = abs(zn.back()) * sign(zn.back()) * k * sig;
            zn.pop_back();
            zn.pb(k);
            k = 0;
            c = s[i];
            i++;
        }

        if (i < s.size() && (s[i] == '+' || s[i] == '-')) {
            if (c == '/')
                k = abs(zn.back()) * sign(zn.back()) / k * sig;
            if (c == '*')
                k = abs(zn.back()) * sign(zn.back()) * k * sig;
            zn.pop_back();
            zn.pb(k);
            k = 0;
            c = s[i];
        }
        if (s[i] == '-')
            sig = -1;
        else
            sig = 1;
    }

    int ans = 0;
    for (int i : zn)
        ans += i;
    cout << ans;
    return 0;
}