// ちょっと早なった？
#include <iostream>

#define sizes(string)  (int)string.length()

using namespace std;

int main() {
	string S;
	cin >> S;

  int ans = 0;
  char cd = '*';
  int cr = 0;
  for (int i = 0; i < sizes(S); ++i) {
    if (S[i] >= '0' && S[i] <= '9') {
      cr *= 10;
      cr += S[i] - '0';
    } else {
      if (cd == '+') ans *= cr;
      else ans += cr;
      cd = S[i];
      cr = 0;
    }
  }
  if (cd == '+') ans *= cr;
  else ans += cr;

  cout << ans << endl;

	return 0;
}