#include <bits/stdc++.h>
using namespace std;

typedef pair<int, int> P;
typedef long long ll;
typedef string::const_iterator State;
class ParseError {};

#define rep(i, n) for (int i = 0; i < n; i++)
#define pb push_back
#define inf INT_MAX / 4
#define ALL(v) v.begin(), v.end()

int number(State &begin);
int expression(State &begin);

void consume(State &begin, char expected) {
  if (*begin == expected) {
    begin++;
  } else {
    cerr << "Expected '" << expected << "' but got '" << *begin << "'" << endl;
    cerr << "Rest string is '";
    while (*begin) {
      cerr << *begin++;
    }
    cerr << "'" << endl;
    throw ParseError();
  }
}

// 数字をパースする
int number(State &begin) {
  int ret = 0;

  while (isdigit(*begin)) {
    ret *= 10;
    ret += *begin - '0';
    begin++;
  }

  return ret;
}

// 四則演算の式をパースして評価結果を返す
int expression(State &begin) {
  int ret = number(begin);

  while (1) {
    if (*begin == '*') {
      begin++;
      ret += number(begin);
    } else if (*begin == '+') {
      begin++;
      ret *= number(begin);
    } else {
      break;
    }
  }

  return ret;
}

int main(void) {
  string s;
  getline(cin, s);

  State begin = s.begin();

  int ans = expression(begin);

  cout << ans << endl;

  return 0;
}