#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define RREP(i,s,e) for (i = s; i >= e; i--)
#define rrep(i,n) RREP(i,n,0)
#define REP(i,s,e) for (i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)
#define INF 1e8

typedef long long ll;

int main() {
    string s;
    int ans;
    size_t len;
    cin >> s;
    ans = stoi(s,&len);
    s = s.substr(len);
    while (!s.empty()) {
        if (s[0] == '*')
            ans += stoi(&s[1],&len);
        else
            ans *= stoi(&s[1],&len);
        s = s.substr(len+1);
    }
    cout << ans << endl;
    return 0;
}